Two random layers of Support W in the middle of the support-structure?

Bambu Lab Software
1

G’day everyone

I am currently printing this moon-lamp:
https://www.printables.com/de/model/64520-moon-lamp-led-strip-mount-ws2812b
I want to print it in Glow in the dark PLA from Overture and use some UV LEDs from the inside.

Since I have some Support W here, I want to use it for the interface, but in the middle of the structure, the slicer sets two layers (389&390 of 919) of it:

grafik
grafik1505×1070 161 KB

I sliced it multiple times, but no change.

X1CC @ 0.4/0.16mm profile, generic PLA with some minor changes, 5 layers in walls and top&bottom, support only on print surface and with a big support blocker to keep the outside support-less

Thanks!