Do you have problems with special characters in your nick name?
Here's the solution:
Open up ContentExpansion\System\Default.ini
Under the [Engine.Engine] header, Find:
Language=eng
SpeechLanguage=intand change it to:
Language=int(yes remove the SpeechLanguage=int line entirely).
Now do the same thing for ContentExpansion\System\Swat4X.ini
(if the two lines don't exist in Swat4X.ini ignore this part).
I assume that tells it 'English International' ?
Hmm...yes its an odd situation...I've only had that problem maybe 2 or 3 times in my career on S4...in which for ex: SAS_Trp_Ranger .... and this was only on a few random Co-Op servers I joined before.... would become SASTrpRanger bunched up like a car wreck :?
If you're lazy, you can also download this fix:
http://www.hot-swat-mods.com/modules.php?name=Downloads&op=getit&lid=741