MK Graphic Bug Is it core or ROM?

Hello I am playing Mortal Kombat (World) ROM on the Genesis GX Plus core & I noticed in some stages some pixels which look off & I have no way of telling if it’s the rom or if it’s the core. I haven’t tried it yet in other cores to compare but I wanted to show these incase anyone epse who played may have noticed these as well.

I noticed it on android first then saw it again on desktop.

I also noticed in Palace the background is off on the edges.


Aside from trying it in other cores what else can I do to check?

These all look normal to me. Indeed, trying the game in another core is a good way to check that.