I talked to a few body builders and they said they had the same problem, their upper arms were growing quicker than their forearms and wrists.
Hummmm....
Usually when a muscle grows out of proportion to the strength capabilities of a tendon and ligament (say the things in forearms and wrists) it's a clear sign of an anabolic enhancement.
You'll also hear that most of the heinous muscle injuries and such come from people who have muscle strength that far out-weights the tendons and ligaments that support the muscle.
Not making any comments here in relation to what you've heard but.. I'd go with what CPL recommended and the things you've come across as well.
Doing exercises to support grip strength would be a great benefit.