does anyone know what causes this glitch?

simple addition, but its a good one

i made a slight move animation, which took me 1 or 2 days to make :)

a little tile game im working on

i made a stickman move on a grid, this took too long

made a new tile, i think you can guess what it does

made bigger grid, fear it

made levels work, progress is good :)

limit tile, which restricts movement

this is one of the final levels in World 1