I have the same issue, and just like the OP, I was also using Crelly Slider before. Changed to Depicter because Crelly Slider was abandoned and isn’t receiving updates for awhile.
For me, it was initially working perfectly, but the crop annoying thing started after I make custom changes for tablet and smartphone breakpoints. Maybe it have something to do with that?
Today is 21th december and I have to finish this slider for the customer before I can hit the road for christmas and its very frustrating. I will try out the resizing and resting crop that people suggested here and hope it works at least for now.
