This is from the developer – Minesweeper Original Reboot Review

For some complaints about inaccurate squares, please read the last section of the description carefully. We tested the game with much care before releasing, to be sure that you have the best experience. The reason that some of you think some squares having wrong number of surrounding mines is because those squares are on the edge of the visible board on the screen but not on the edge of the real one, hence you did not see other blank squares around them. By using preview mode or dragging the board around, you could easily see the issue. Please, drop us an email telling about the problem to be sure that we deserve a 1 star or bad reviews. We are always happy to give discussions or support. SkyPaw Team
Review by A.C.Ryan on Minesweeper Original Reboot.