What makes your contact lenses stick on to your eye and move more to the back of your eye?

Is that from dry eyes or from tired eyes?

Certainly not tired eyes.

There are different reasons a lens might do that. Either the lens is the wrong base curve and fits too tight causing it to stick, or it is drawing too much moisture from your eyes not leaving enough to make a tear cushion behind the lens, again causing them to stick, or you have dry eyes to begin with and the lenses can't get enough moisture at all to stay soft and that causes them to stick again.

The lenses have to be seen on your eyes under magnification to see what is going on.