is it a problem that I get wet dreams twice/thrice a month at 25?
It is only a problem if you regard it as such. Yes, what typically occurs is that when boys reach initial sexual maturity they will have wet dreams and this may often settle down or disappear once regular masturbation is engaged in, or / and the male becomes sexually active.
Without knowing your personal behaviours and how you psychologically regard these, and what is happening, in terms of the wet dreams - then, only you can conclude on whether there is a problem going on for you or not
I’m on hard-mode nofap and haven’t had sex for a while