So basiclly, i built a little and simple contraption that push a block to the side ans up, like a little hidden door, it looked like in the pictures(below), i tried to push the observer block with it and that block just glitched out and like puushed down and then teleported back to where it was, that was weird, i tested out something with that and i managed to get what the problem is, the redstone was in like with the detecting part of the observer block, which caused the piston to push the observer block down and push it up again ,cuz it was 1 tick, and then the observer block stays in place cuz the redstone updated the observer block which powered for some reason the piston below it, and then caused it to retrack fast and the other 2 pistons pushed the normal piston back to place, please fix it mojang.