Fun but some puzzles not correct

Best design for a picross app Ive come across so far. The only problem Ive had was when one of the puzzles had more than one way of being solved; all the numbers on the rows/columns were grey, but it didnt count as finished. I had to use up several of my hints to find the "correct" way of solving it. Ive only had one problem like that so far, but Im not too far in the game. Hopefully it doesnt happen again, otherwise its a really fun app :)

Little Ms. Mimi about Nonogram - IQ Logic Pic Puzzle, v1.0.13