Invalid sudoku

[JesperVa]

I generated a moderate 9x9. Only remaining value for middle block is 2, but is blocked by a generated 2 even though I am at 0 mistakes.

Putting in the sudoku in a sudokusolver generates at least 10 valid solutions, which invalidates proper sudoku regimes.

[Riksu9000]

Hi. Sorry, but it seems to me that the puzzle is valid. Do you happen to have mistakes checking set to rules violations, which doesn't catch all mistakes immediately?

[kaajjo]

Check mistakes checking setting. The default is rule violations, you can choose to check values with solution. This puzzle has one unique solution, so it's valid, you just made a mistake somewhere