You don't mention the type of magazine you are using. One posibility is a new mag with better springs, which will present the round sooner and not allow the bolt to override a round before it is raised high enough.
Another issue may be an incorrect mainspring. This Luger was originally a 9mm, so it may still contain the stronger 9mm mainspring, which would also explain the bolt coming forward faster than a round can be brought up to meet it.
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