I got the Sateen sheets specifically, but each duvet cover should have the same amount of ties. I would confirm with support though before ordering.

Also the specific duvet I got is their humidity fighting duvet, which I highly recommend in general!

Casper’s newer duvet and cover have 7 tie points, one on each corner and then an additional center one on 3 sides. It’s amazing as I had the same issue you mentioned before, now it never shifts out.