my first board made with KiCad was delivered today from China. I am very happy with it. The only little Disappointment is a little error on the silkscreen. I don't know, where the error lies. The gerber files seems to be ok. I have a guess. Like Joan_Sparky says: Don't use Circles on silk screen. Cheap chinese Boardhouse have an issues with it.
The only circle i use, is the small Pin 1 Indicator on the BM280 -> U1.
To all newbies like me -> Don't use circles