puu.sh/HDrwT.jpg if I trying to harvest this red cable. my droppers do 2-3 times clicks. I tested with a regular Redstone line. that’s doesn’t happen

It’s block updates, not the power. Vanilla droppers will drop an item if they are powered anytime they get a block update. If they are powered with no block updates they won’t drop anything, you can swap the power all you want but if you do it in a way that doesn’t cause a block update they won’t …