In slime block elevators, which rely on a system of small piston units that act as conveyors, the group of blocks being moved will commonly have some blocks duplicate during movement. This gets in the way of the mechanism and throws the whole machine off. This bug seems to become more common as a greater number of columns of these units are added (which increases the lifting power of the system). I have tried this on elevators with both 2 columns of units and 3 columns. In the former this bug happens occasionally, in the latter, almost every time. I hope that you can fix this issue, especially as I am going to attempt to create a massive elevating floor area, which would have 24 columns.

P. S. My account name is llApolloll