At the points of the arrows there are printed dots, it looks like stiching.
Is this normal or can I undo this in the software ?
Yes. That is the overlap from top layer(s) and direction change. Wet filaments can also cause this.
You can use the Orca Slicer software and further calibrate each of your filaments to reduce this. IIRC it will be the pressure advance.
Thank you, this will explain a lot, it happens after a few days, all the other projects looks fine,
but the last days it’s only raining, and I didn’t removed my filament from the printer,
so the filament must be wet.