imagepng not displaying what it should - php

Question

So i was working on signature system, and last night it worked, it displayed image, but i went to sleep, turned off my pc, and when i got back on i figured out that it has stopped working, it started displaying this image, which was displayed last night but i got it working somehow, i don't know how to be honest.
This is what i get:
WHEN I TRY TO GET IMAGE: http://i.imgur.com/A96dYZp.jpg
PHPINFO: http://i.imgur.com/AjFJ3VF.jpg
CODE:
<?php
if (file_exists(dirname(__FILE__) . '/SSI.php')) {
require(dirname(__FILE__) . '/SSI.php');
}
else die("GRESKA: SSI.php nije pronaden!");
error_reporting(E_ALL);
$username="root"; // KORSINICKO IME
$password=""; // ŠIFRA
$database="smf"; // BAZA
$host="localhost"; // HOST
$con = mysqli_connect($host,$username,$password,$database) or die( "GRESKA: Dogodila se greska pri povezivanju na bazu podataka!");
if(isset($_GET['id'])) $korisnikov_id = $_GET['id']; // DOBAVLJA KORISNIKOV ID
else if(isset($_POST['id'])) $korisnikov_id = $_POST['id'];
$korisnikov_id = mysqli_real_escape_string($con, $korisnikov_id);
if(isset($_GET['stil'])) $stil = $_GET['stil']; // DOBAVLJA STIL POTPISA
else if(isset($_POST['stil'])) $stil = $_POST['stil'];
$stil = mysqli_real_escape_string($con, $stil);
if($stil == 1 ) // STIL I
{
$query = "SELECT * FROM `smf_members` WHERE `id_member` = '$korisnikov_id' LIMIT 1"; // VADI PODATKE IZ KOJE TABELE?
$rezultat = mysqli_query($con, $query) or die(mysqli_error());
if(mysqli_num_rows($rezultat) == "0") die("GRESKA: Taj korisnicki ID ne postoji u bazi."); // ID JE 0 ILI JOS NIJE REGISTROVAN???
$row = mysqli_fetch_assoc($rezultat);
$ime = $row['real_name']; // KORISNIKOVO TRENUTNO IME
$postovi = $row['posts']; // POSTOVI
$grupe = $row['id_group']; // GRUPA
$spol = $row['gender']; // SPOL
$email = $row['email_address']; // KORISNIKOV EMAIL
$vreme = $row['total_time_logged_in']; // VREME PROVEDENO NA FORUMU
// KONVERTER VREMENA
function secondsToWords($vreme)
{
$days=(int)($vreme/86400);
$hours = (int)(($vreme-($days*86400))/3600);
$mins = (int)(($vreme-$days*86400-$hours*3600)/60);
return sprintf("%dd %dh %dm", $days, $hours, $mins);
}
if($spol == 1) $spoltext = "Musko";
if($spol == 2) $spoltext = "Zensko";
if($spol == 0) $spoltext = "Nepoznato";
// DOBAVLJAMO STVARI DIREKTNO SA PROFILA
global $context, $settings, $modSettings, $db_prefix, $boardurl;
loadMemberData(array($korisnikov_id), false, 'profile');
loadMemberContext($korisnikov_id);
$context['status'] = $memberContext[$korisnikov_id]['online']['text']; // ONLINE/OFFLINE STATUS
$context['avatar'] = $memberContext[$korisnikov_id]['avatar']['href']; // AVATAR
header("Content-type: image/jpeg,image/gif,image/png"); // PRETVARA STRANICU U SLIKU
$Potpisi = #imagecreatefrompng("cover_1.png"); // LOKACIJA SLIKE
$BOJA_BELA = imagecolorallocate($Potpisi, 255, 255, 255);
$BOJA_CRVENA = imagecolorallocate($Potpisi, 255, 0, 0);
$BOJA_PURPLE = imagecolorallocate($Potpisi, 128,0,128);
$FONT = "./Fontovi/BebasNeue.otf"; // FONT
$ADMINISTRATOR = 'Administrator'; // RANKOVI
$SMOD = 'Super Moderator'; // RANKOVI
$CLAN = 'Clan';
if($grupe == 1) // GRUPE
{
imagettftext($Potpisi, 21, 0, 115, 50, $BOJA_BELA, $FONT, $ime); // VELIKO IME
imagettftext($Potpisi, 17, 0, 115, 90, $BOJA_CRVENA, $FONT, $ADMINISTRATOR); // ADMINISTRATOR
}
else if($grupe == 2) // GRUPE
{
imagettftext($Potpisi, 21, 0, 115, 50, $BOJA_BELA, $FONT, $ime); // VELIKO IME
imagettftext($Potpisi, 17, 0, 115, 90, $BOJA_PURPLE, $FONT, $SMOD); // ADMINISTRATOR
}
else
{
imagettftext($Potpisi, 21, 0, 115, 50, $BOJA_BELA, $FONT, $ime); // VELIKO IME
imagettftext($Potpisi, 17, 0, 115, 90, $BOJA_BELA, $FONT, $CLAN); // CLAN
}
imagettftext($Potpisi, 13, 0, 75, 194, $BOJA_BELA, $FONT, $postovi); // POSTOVI
imagettftext($Potpisi, 13, 0, 210, 194, $BOJA_BELA, $FONT, secondsToWords($vreme)); // VREME PROVEDENO ONLINE
imagettftext($Potpisi, 13, 0, 354, 194, $BOJA_BELA, $FONT, $spoltext); // SPOL
imagettftext($Potpisi, 17, 0, 115, 70, $BOJA_BELA, $FONT, $email); // EMAIL
imagettftext($Potpisi, 17, 0, 115, 110, $BOJA_BELA, $FONT, $context['status']); // ONLINE/OFFLINE INDIKATOR
// DOBAVLJAČ AVATARA SA PROFILA KORISNIKA TE KONVERTER SLIKE
if (exif_imagetype($context['avatar']) == IMAGETYPE_GIF)
$traziavatar = imagecreatefromgif($context['avatar']);
if (exif_imagetype($context['avatar']) == IMAGETYPE_PNG)
$traziavatar = imagecreatefrompng($context['avatar']);
if (exif_imagetype($context['avatar']) == IMAGETYPE_JPEG)
$traziavatar = imagecreatefromjpeg($context['avatar']);
list($width, $height) = getimagesize($context['avatar']); // KONVERTOVANJE AVATARA
$context['avatar'] = imagecreatetruecolor(512, 512);
imagecopyresampled($Potpisi, $traziavatar, 16.5, 25, 0, 0, 92, 92, $width, $height); // PRIKAZ AVATARA
ImagePng($Potpisi);
ImageDestroy($Potpisi);
}
else
{
die("GRESKA: Taj stil ne postoji u bazi podataka! Pronadjeni stilovi (1) , (2)");
}
?>
My logs contain the following:
[Fri Feb 19 15:52:12.629932 2016] [ssl:warn] [pid 5848:tid 248] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Fri Feb 19 15:52:12.699932 2016] [core:warn] [pid 5848:tid 248] AH00098: pid file C:/xampp/apache/logs/httpd.pid overwritten -- Unclean shutdown of previous Apache run?
[Fri Feb 19 15:52:12.859932 2016] [ssl:warn] [pid 5848:tid 248] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Fri Feb 19 15:52:12.899932 2016] [mpm_winnt:notice] [pid 5848:tid 248] AH00455: Apache/2.4.17 (Win32) OpenSSL/1.0.2d PHP/5.6.15 configured -- resuming normal operations
[Fri Feb 19 15:52:12.899932 2016] [mpm_winnt:notice] [pid 5848:tid 248] AH00456: Apache Lounge VC11 Server built: Oct 13 2015 10:54:13
[Fri Feb 19 15:52:12.899932 2016] [core:notice] [pid 5848:tid 248] AH00094: Command line: 'c:\\xampp\\apache\\bin\\httpd.exe -d C:/xampp/apache'
[Fri Feb 19 15:52:12.909932 2016] [mpm_winnt:notice] [pid 5848:tid 248] AH00418: Parent: Created child process 2576
[Fri Feb 19 15:52:13.449940 2016] [ssl:warn] [pid 2576:tid 260] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Fri Feb 19 15:52:13.791941 2016] [ssl:warn] [pid 2576:tid 260] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Fri Feb 19 15:52:13.831941 2016] [mpm_winnt:notice] [pid 2576:tid 260] AH00354: Child: Starting 150 worker threads.