Pistons gets stuck and doesn't react to redstone!

I'm having an issue here. On random (seemingly) random moments after entering my world i came across some of my pistons. In the machine, they where continiously powered. At first view they seem unpowered (retracted) while they should be extended, they have an active redstone input.

First screenshot, on 30 june: In my witch farm (that doesn't seem to work either) the pistons (27 of them) have to stop the water. The water stands still as if the piston is extended. Visually it was retracted, while it is powered! Toggling the redstone power on and off doesn't update or change anything with the glitched pistons. Breaking the them resulted in a normally drop and the water started to flow.

It was absolutely weird when i was able to place a tripwire hook on top of the piston. The tripwire hook was invisible after placement. Breaking the tripwire hook resulted to extend the piston again and it functioned normally again.
(In the first screenshot, the pistons on the left are glitched, the other ones are already repaired)

My first encounter with this (a week ago) was with a single piston, wich was powered directly with a lever all the day long. One time a walked by and saw it was retracted. I flipped the lever like ten times but would happen. Breaking and replacing was the only option.

If this would happen on large redstone machines it would really be a pain in the butt.

If have now at the time no idea how to reproduce it. As soon as I encounter it again I will try to make more footage.

Has anyone encountered this problem to?
Sorry for the grammar, I don't speak english often....