More than one solution? – Cool Sudoku & Cool Puzzles Review

I've always been fairly happy with this app, but recently I've solved are coming up as incorrect. Particularly kakuros. I've screenshot them, run them by several people, I have a working solution that violates no rules. If it had only happened once I'd be OK with ignoring it, but it's happened to two puzzles this week alone.
Review by Osadczuk on Cool Sudoku & Cool Puzzles.