RESOLVED: I had problems with the rendering, switching to CPU rendering fixed the display.
I can't figure out what's wrong here.
I turned a font into outlines so I can adjust the shape a little more. My problem is that the color-fill of the shape is not filling the shape fully (the fill even extends a little over the edge at some places). This is happening throughout the whole shape. I have this problem even if I draw something new with the pen tool (in the same file).
You can only notice it if you zoom in.
Any ideas on what's happening?
I added a picture of how it looks like: