SQL Insert over VPN has strange results - php

Question

I am not sure if I'm doing something wrong? Whenever I connect to the office wifi and test my apps registration features, the email section shows a different result from my input. Example if I enter test#test.com and the go into phpmyadmin to check, it will be test#nefiewx.legsq.nl3.gsr.awhoer.net. Is something wrong with my code or do I have to avoid using the wifi?
I had to use a vpn to access my phpmyadmin but I see that some of the address in the URL is similar to what has been entered into the database.
This is my insert code. Thank you
<?php
include '../configuration/credentials.php';
if($_SERVER['REQUEST_METHOD']=='POST'){
$conn = mysqli_connect(DB_SERVER,DB_USER,DB_PASSWORD,DB_DATABASE);
if($conn->connect_error){
die("Connection failed: " . $conn->connect_error);
}
$firstname = $_POST["firstname"];
$lastname = $_POST["lastname"];
$dateofbirth = $_POST["dateofbirth"];
$email = $_POST["email"];
$phone = $_POST["phone"];
$password = $_POST["password"];
$firstname = mysqli_real_escape_string($conn,trim($firstname));
$lastname = mysqli_real_escape_string($conn,trim($lastname));
$dateofbirth = mysqli_real_escape_string($conn,trim($dateofbirth));
$email = mysqli_real_escape_string($conn,trim($email));
$phone = mysqli_real_escape_string($conn,trim($phone));
$password = mysqli_real_escape_string($conn,trim($password));
$checkuserexistsquery = "SELECT email, phone FROM users WHERE email='$email' AND phone='$phone'";
$insertuserquery = "INSERT INTO users (firstname,lastname,dateofbirth,phone,email,password) VALUES ('$firstname','$lastname','$dateofbirth','$phone','$email','$password')";
$checkuserexistsresults = mysqli_query($conn,$checkuserexistsquery);
if($checkuserexistsresults===FALSE){
echo "Check user query failed";
}else{
$countcheckuserexistsresults = mysqli_num_rows($checkuserexistsresults);
if($countcheckuserexistsresults>0){
//user already exists
echo "User already exists";
while($row = $checkuserexistsresults->fetch_assoc()){
echo $row['email'];
echo $row['phone'];
}
}else{
//user doesn't exist
$insertuserresults = mysqli_query($conn,$insertuserquery);
if($insertuserresults===FALSE){
echo "Insert user query failed";
}else{
echo "Insert successful";
}
}
}
mysqli_close($conn);
}
?>
Hope I can get help with this