Yesterday and today I had problem with moving. It seems that I can't move forward and right\left at the same time. Today two maps changed and I still had that problem. But yesterday in second map it was all fine again. I don't know why that is happening. Some guys told me that they had the same problem. I really tried to change all controls but it didn't worked. Does anybody know what that is?

And I play on OMONAS server only. So, is the problem server or something else?

Hi balkantina,
This problem has been faced many times by many players including me on different systems. Everything just seems fine accept that two keys are not able to be pressed together. I had not been able to find a proper solution it.
You should search on Steam forums and post there concerning your problem as they will be best at helping you.
Regards,
RaHBeR