Skunk Cleaner Shrimp Bent/Broken Antenna

[Tnops]

Hello, one of my skunk cleaner shrimp’s antenna is now shorter and bent. There are no other invert in the tank other than a conch and a pistol shrimp which lives under the rock which I never see

 

[Tnops]

Note: This was happening to my other skunk cleaner before it died