It looks like overextrusion but only on certain prints

When I print this 2 color benchy it either fails comletely or when it can finish it looks really bad but when I printed these 4 mounts for the dayspring leds it worked fine, so I think its more likely a software issue. I have no idea what settings I have to change and I already lowered the print speed to 100 mm/s. It also looks like the Z offset is wrong but I recalibrated that a few times already.