.htaccess te ve functions.php de url ler aynı olmalı
buda replaceler bunları ekleyebilrsn
$file_title = str_replace(" ","-",$file_title);
$file_title = str_replace("(","",$file_title);
$file_title = str_replace(")","",$file_title);
$file_title = str_replace("'","_",$file_title);
$file_title = str_replace(":","_",$file_title);
$file_title = str_replace("ä","a",$file_title);
$file_title = str_replace("ö","o",$file_title);
$file_title = str_replace("ü","u",$file_title);
$file_title = str_replace("ç","c",$file_title);
$file_title = str_replace("Ç","c",$file_title);
$file_title = str_replace("Ö","o",$file_title);
$file_title = str_replace("Ü","u",$file_title);
$file_title = str_replace("ı","i",$file_title);
$file_title = str_replace("İ","i",$file_title);
$file_title = str_replace("ğ","g",$file_title);
$file_title = str_replace("Ğ","g",$file_title);
$file_title = str_replace("ş","s",$file_title);
$file_title = str_replace("Ş","s",$file_title);