Some puzzles not possible

I enjoy the game. It fun and challenging to solve the puzzles.
After purchasing the Hard pack I had trouble with a couple of the puzzles to the point where I pushed the hint button.
Twice now on two separate puzzles, the hint contained illegal moves which put pieces off the playing are completely.
That leads me to now believe that this will continue and makes me not want to continue to solve a puzzle that may be impossible to solve.
I hope I explained this correctly. Quite disconcerting.

Richie0496 about Move it!, v1.35