That could be a issue with both the hop up unit and mag not being completely compatible. That being said, most of the blame is on the mag for not having a spring strong enough to push the BBs up in to the nozzle area.
Easiest way to solve this would be buying more mags that feed(Same brand/Same type ones that are feeding right now).
Maintain your mag's spring strength by taking out all the BBs that are in the magazine after every game.
Hope that helps
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