I've got a really annoying issue with the platform for my game, when testing out my game i've noticed a dark line that appears on some of the platforms and i can't figure out why that is. It happens on random platforms and can be quite noticable, especially when you notice it the first time. Most platforms appear correctly, but the ones with a dark line at the top are really bugging me and have no idea what it could be.
I've posted a picture below so you can see.
Also what i have noticed is that if i erase just small bit off the top of my platform, a line appears that forms the shape of the platform, which you can see below.
I don't know why this appears, whether its a bug or not but it's really annoying. Can anyone help me out on how to fix this?