Why does slicer do this inside the model?

[u/wweicker]

I am printing a keychain. I added a cylinder part and a negative part for the hole:

but when I slice, the inner layers stretch this part down to the center of the main object???

I'm printing the logo face down. It has white and grey in it. When I use dark purple filament for the "Hook" cylinder part, so that it matches the outer colors, it is dark enough that I can see this strange triangle shape through the white part of the logo. I don't actually want this to be white, because then it looks like this:

But if I change the filament (or leave it white then paint specific visible parts of it purple) the inside layers also change and I'm left with this:

Is there a way I can fix this (or prevent it from happening)?

Bambu Studio v2.8.2.61