Hitbox gets stuck on tilemap corners.

I'm making a topdown 2D RPG game with tilemaps. But whenever I move my character diagonally against a corner of an object it gets stuck and can't continue moving forwards, only backwards. Unfortunately I can't record this, as my pc sucks but here's a picture of where it happens:

I'm sure this is not hard to fix and has something to do with hitboxes but I don't really know. If anyone can help me out that would be great, thanks!