Games full of mistakes!

Bottom line is, the games are often incorrect! As in, there is an opening in a block for, lets say, a 5, but the line and row the spot is in already have a 5 in them. So, clearly one of those is wrong, but the game has given them the green light! (It is supposed to turn the number red if you place it in the wrong spot.)
Typically you dont discover this until youre halfway done with the game, so its really just been a huge waste of time to even fill any part of that puzzle, as theres no way possible to solve the entire thing. Ridiculous. The colors, design, Bella and whistles are all negotiable. Having only one numeral per row, line and block, is not. Ive deleted this from my phone.

Tsohcvq about Stress Free Sudoku Game Book!, v1.5