workaround for ground anchor settling in clay
Put in a warranty with whomever you can &amp; ride it out until warmer weather for a full reveal &amp; adjustment, the anchors look somewhat adjustable &amp; may permanently fix any initial settlement. This could be freeze thaw settlement &amp; you may find movement stops in warm weather. Indicating the anchors were not installed correctly by not going below the frost line.

Masking tape outlined with a pencil over the drywall crack is a better movement monitor. The masking tape is just to make it pretty, you actually keep marking the wall every time it moves. To get an idea of how much it's moving, why it's moving, how it's moving &amp; therefore when it stops moving &amp; even goes back up.

Drywall patching &amp; window sash resealing will only succeed when the box frame finally rests on the ground, if the movement doesn't stop on its own. If there's no warranty anywhere &amp; especially not on any paperwork, then your best &amp; really only course of action is to put in a real foundation with really big feet fat stinky feet. Anchors only work when they contact ledge rock &amp; only companies that do it right do that.