A sudoku puzzle should have exactly one solution. Unfortunately there are many apps, web sites and books which show puzzles with more than one answer.
A new member joined my Sudoku Puzzles Facebook group recently and advertised a book he was selling on Amazon. I asked him to show us a sample puzzle and he sent quite a few. However, several of them had multiple solutions.
When this was brought to his attention, he did not seem to believe us as he had apparently paid to use the program which created his puzzles.
In cases such as this, you may have to show the multiple solutions to prove your point.
You can do this here. Key in the puzzle in the central grid, select the COMPUTE ALL SOLUTIONS button then click the > SOLVE SUDOKU box. The solution(s) will appear down the left hand side of the screen:
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