I found a weird issue after submitting my design to JLCPCB. Some arcs are flipped the wrong way around in their gerber viewer and thus they are manufactured differently. Here is how my original design looks like:  And this is how it was interpreted at JLCPCB side:  Some other designs that I ordered with a similar pattern turned out correctly. The Only thing I remember that was different here was me flipping and mirroring parts of the silk layer.