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Static might be a cause but a bigger cause is the failure to clean the case neck of all lube or crud. On necked cases lube is almost always used for sizing, neck turning, expanding, etc. If it isn't properly cleaned out it can cause powder granules to stick and in turn the powder check "plunger" will stick. What AMProducts mentions about cleaning the plunger holds equally true for any cases where lube was applied inside the neck.
That makes sense. Teflon (PTFE) can become statically charged very easily.