Is it a new magazine? For the period I owned a G23, I did not have a problem chambering the first round. Getting the "last" round into the new mag was challenging, but once I did, I let it sit for a week or two and everything was normal.
Either:
1. The mag is not fully locking in place because of the stack tension. (Smack the crap out of it when you seat it in the gun!)
Or:
2. You are riding the slide down with you hand after you pull it fully to the rear and release it. (Pull it all the way back, and then let it go.)
It will have more force then it would have starting from the slide-lock release point.
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