With two subs you shouldn't be having to boost that low unless you are getting some modal cancellation which would imply poor placement (I know sometimes you have no choice).
Having such a large boost so low is very likely to cause you issues, it may be worth double checking with the installer it isn't a typo in the document?
Any kind of boost below 100Hz is generally a no-no but +10dB @ 25Hz is pretty excessive. Even if you don't have it loud enough to clip you are seriously eating into your available headroom.
I would definitely get this looked at as at the very least you aren't going to be getting the best from your subs.