My friend's fake racket also met this situation. This is mainly because of the poor graphite used to make the frame of the racket. My friend strung his racket @ 24lbs and his racket ended up like this. It will just break some day later.
Played 4 hours with it today. Did a dozen of my best bang and still holding and performing great. I have 3 of these. This is with the lowest tension string on it. 27lbs. I did a few searches, and saw quite a few with cracks like these. The problem is the gromets will expose string to frame, causing them to snap.
This is not fake but fleets version of zforce. But totally different specs.