Thank you for reply.
Link to the store: http://www.nove-lece.si/si/
No I am not using any special modules, i have one modul for express checkout but it is the same problem with or without module.
I can not find solution for this, it happens actually from begining of instalation.
It is the same problem with any kind of product that has two or more attributes.
Now i have found that if I enabe also English version of the language, suddenly things work fine, so what would be solution?