Trip wires getting stuck

So I have this world where I use trip wires for a witch farm. After awhile of the farm running the trip wires get stuck on (even if i destroy and replace the trip wires). When you save and quit and then re-enter the game its fixed. I can't find anyone else having this problem and its not my world as I made the same farm in a fresh world and had the same problem, I couldn't find a way to repeat it, other then just letting the farm run for awhile. The time fluctuates. I believe this is caused by and entity that isn't there anymore but still triggers the trip wire. Much like a ghost entity. I might be totally wrong however.