Comparators will randomly fire off a Full signal while reading a chest that does not have the adequate items to complete that signal whenever the chunk loads.
This one is totally random. I have a set of 6 chests being read from a comparator. 60% of the time when loading the chunk the comparators will fire off a full signal when it does not have the required items to fire a full signal.
As you can see in the pictures the redstone blocks that have been pushed down are the comparators that read a full signal and fired the regular pistons.
This makes comparators useless when trying to calculate how many items are in a chest for occasionally they will fire.
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I've not been able to replicate this issue, would you be able to upload a world file where this is happening?
I have attached a world download.
Keep save and quitting the game and loading it back up over and over. eventually you will see the redstone blocks move.
The comparators fire during Chunk loading 50% of the time...
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Update so just found out I had the items on the bottom right row of the chest. When the chunk loads it reads it as a full chest and fires the signal. When I place the items on the top row it worked correctly.
Easily avoidable issue and pretty dumb on my part lol. Its still a bug you can recreate it by creating the following circuit a double chest with a comparator two redstone lines into a block with a repeater on the end followed by a regular piston and a random pushable block.
place the items in the bottom right row and keep quitting and rejoining the world eventually when you join you will see the block has moved because of the comparator.