CZ 52 problem

Well it seems now I have another issue, the slide won't lock back after the last shot now.
It does manually, and it did before the roller cam change, so it's not the mags.
I have two original and two new(not triple K) and they worked before the change.
The lock itself and the slide hole don't look rounded.
Could it be I need a new recoil spring maybe?
 
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