Cube Sinks When Character Lands On It

for the last few months I have had an area on a level that has some cubes with interp to movement back and forth. I could jump from block to block as they were moving. Now for some reason all of a sudden , the blocks sink down when the character lands on it. I never changed any settings on the blocks or any collision settings and do not simulate physics. Why would all of a sudden this start happening?

Anyway setting the cubes collision to “block all” seems to work. I had to create a volume to not be able to save in that area, because if you save on a moving block , he wont be on it when you load though. As it saves character location and rotation but not the cube’s.