Sketch to image “Can’t generate due to location of drawing”

What exactly causes the problems of the pop ups that say “Can’t generate due to location of drawing”? Or the one that says “draw smaller or closer together”?

Cause Even when I do simple ones like drawing glasses on a face it’ll show this, but it’ll have no issues generating a hat. Or I’ll sketch a watch on my wrist and it works, but when I try to draw a glove on my hand it’ll say its “too big” or needs to be “closer together”. I don’t get it. What exactly causes this?