There are LOADS of threads about this, and always good idea to search the forum before posting about an issue–often you can find a solution that way.
It’s great you included lots of photos, but often it’s nothing to do with the unit, but the flatness of the material (nearly all sheets need to be pinned down with the “hold down pins” (search for those in free patterns & make loads–I use my scraps of med maple ply). Also if you have higher humidity than about 40%, slowing down about 10 pts in speed really helps.
But if the lens is upside down, that will drop the effective power–if etching is OK, but just cutting, then that’s not it. (Learned that one myself!).
And as a good rule of thumb, when cutting, never move the sheet until you’ve verified the part is cut out by seeing if it can wiggle–the kerf provides plenty of room to feel the piece shift if it’s cut fully through (though complicated shapes that may be more difficult).