URL rewriting

please give me urgent solution in the admin panel url
when is create new post or page and submit my domain name changed like
http://wwww.mydomain.se/…….
and after submitting it changed into
http://wwww.mdomain.se/…….
mean one character of domain is missed “mydomain” to “mdomain”.

and in my CPanel root directory have two folders(wp and xn--mdomain-zzb.se) like as
/
wp
xn--mdomain-zzb.se
and “xn--mdomain-zzb.se” have three folder log, data and public_html and my project in public_html folder
please give me a solution guys how i can solve my problem about domain when i edit or submit post or page or any thing domain name missed one character “mydomain” to “mdomain”