Z depth and redraw issue

I have built an icon carousel and it is work well except that as the icons move around the stage they break up and get lines through them. As if the screen can’t redraw the icon fast enough.

The icons are all vector, stored in the library with linkage. There are 5. I am altering their z depth to change their size and using SimpleZSorter for managing indexes. Scaling doesn’t seem to have the same lines issue, but I can’t get it to behave like I want.

Any thoughts on z depth and redraw issues?