Incorrect column

Hi, I’m using a tileset from Kenney’s and I’m having trouble with adjusting its tile sizing. I’m very new at this btw. I’ve matched the tile width and height (the one you cant change after saving the tileset) with the one for Kenney but i checked their sample and noticed it was off because my columns are never the same as them… This is my assignment and i cant find what to do anywhere else than here.

If you picked the wrong tile size, you can still change it here: