I've been playing crysis 2 online since 31st of May, while I was in the UK. Now that I'm in Thailand and is trying to play online, I found that I'm back to level 1, instead of 29 which was where I was at when I was playing in UK. If anyone knows whats going on please let me know. Many thanks

Maybe you are in the situation described here:
https://secure.gamesas.com/forums/viewtopic.php?f=41&t=31456

Did you change your console?