String showing special characters as it was urlencoded - php

Question

I've got a site where the user can upload a csv file with some information and I read and save that information in the database. The problem is, the user sometimes report that the information he/she uploads appears with "strange characters" in the browser and I've checked and it was saved in the database the same way (with "strange characters). So I asked for the file he/she used and upload from my computer and everything went fine. The user uploaded from a Mac computer and I uploaded from a Windows computer. The server with the site is Windows.
Here's a print of the error the user describes:
I can upload that same csv and that string stays ok. I noticed the "strange characters" are codes for url's. For example the space is replaced by %20 in the print. But this string comes from a csv file that apparently is ok. And as I can't reproduce the error it's hard to understand what could be happening. But all seems to be some kind of encoding problem between Mac-Windows. Do you ever got this king of problem?
EDIT:
Here's the code that handles the csv file:
while ($valor = fgetcsv ($handle, filesize($T2), ";")){
for ($i=0;$i<$conta;$i++){
$cv=$data[$i];
$row[$cv]=trim($valor[$i]);
}
if ($row['Ano']==$sql_Documento['Ano'] && $sql_Documento['NumDocumento']==$row['Numero']){
$count++;
$campos = array();
$campos['IdDocumento'] = $sql_Documento[IdDocumento];
$campos['Sociedade'] = mssql_escape_string($row['Sociedade']); //this is the field that gives me problems
$campos['DocumentoId'] = $sql_Documento[DocumentoId];
$campos['page_dr'] = $row['Pagdr'];
$campos['page_file'] = $row['Pagpdf'];
$DocumentoId = insertNewRecord("DocSoc",$campos);
}
}
The mssql_escape_string is this function:
function mssql_escape_string($data) {
if ( !isset($data) or empty($data) ) return '';
if ( is_numeric($data) ) return $data;
$non_displayables = array(
'/%0[0-8bcef]/', // url encoded 00-08, 11, 12, 14, 15
'/%1[0-9a-f]/', // url encoded 16-31
'/[\x00-\x08]/', // 00-08
'/\x0b/', // 11
'/\x0c/', // 12
'/[\x0e-\x1f]/' // 14-31
);
foreach ( $non_displayables as $regex )
$data = preg_replace( $regex, '', $data );
$data = str_replace("'", "''", $data );
return $data;
}