Maze generation won't work properly

I am trying to make a 3d maze game but the maze sometimes won't generate right, when you go to one of the edges it is 2 wide space (idk how to explain), how do i fix this?

dropbox.com/scl/fi/3qirai4ua1x2nzwmrdu1u/Maze.c3p

Maybe try a different algorithm to generate the maze? Or you’ll have to explain how the algorithm you’re using should work. Maybe your logic is flawed, or maybe you made a typo somewhere.

The code i used was in a youtube video, i checked it so many times, and i still can't find whats wrong with the generation

This is the video i used youtube.com/watch