I had 2 voltric z-force (both regular editions, same U & G so tension ranges the same), strung in the same stringing session, using same strings, by the same stringer on a machine stringer, using the same tensions. However, when I used them both for the first time after re-stringing during the same practice session, I notice the strings on one racquet (i'll call it A) "splayed" like this ()(), while the other one's strings (call it B) stayed in place markedly better. Only difference between racquets A and B is that I've had and used B for about half a year longer and play about 2-4x weekly, whilst I've just gotten A and that was my first time playing with it. Im kinda concerned, and all insights into why this is happening is appreciated. Thanks!