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That's it's anti-jam in effect. Basically, the Spire's anti-jam is to just push balls up, but if they're not fully seated it will push them up or "popcorn".
I wouldn't call this popcorning because they're not flying everywhere, but I would call it a quirk that the ball needs to be ALL the way down otherwise it will pulse and shove it up.
As stated, change your settings to fix it.
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