Rubber shock covers on 5100’s riding up

I have been noticing that my rear shock boots or sleeves( just a guess at what they’re called), have been riding up,with or without zip ties at base.
Is this normal? I replaced zips and tightened them well and will have to wait....thoughts or suggestions?

 

To prevent the shock boots from riding up, I cut the boots a little shorter and allow them to hang like a skirt. No zip ties and in doing so any water or crud that does get inside the boot is allowed to drain out.....

https://www.tacomaworld.com/threads/shock-boots-like-a-wrinkled-sock.564560/

 

Dish soap on the shock itself.