Thanks guys, i didnt fix my problem, but found another solution.
Royi, i deployed IC, it works, but it not recognize Radius users, dont see them, anyway i kept it.
Chris, your solution works (i played with realm info), but looks like WLC send info to CheckPoint (and own log) before NPS (Radius) server, i can change realm info, but CHeckPoint sees original request with domain info.
I blocked any access to wireless with domain info, just username, or no wifi 🙂
Also opened Cisco's support case, not sure, maybe possible to cut realm info on WLC directly
thanks guys!