I'm not sure about my gerber files. I guess there is something wrong.
In different gerber viewers the PCB looks right. But in online viewers from JLCPCB and PCBway, the bottom view looks wrong. Some traces are missing.
Bottom layer (everything is there):
Bottom view (some traces are missing):
Where are the missing traces? It's only a 2 layer board. And all traces are displayed in the bottom copper layer, but not in the bottom view. The top layer looks fine. I don't understand this.