Hello from germany!

I want to print the FatMan https://www.thingiverse.com/thing:4050981/files and I have problems with the "Tail Assembly".

Normaly the Tail Assembly looks like this:

But if I sliced it with Chitubox 1.6.3 the program closed the hole in the middle and ist looks like this ...

I can change the direction of the part, every time the program closed it.

Maybe a bug in the program .... and I hope not in my mind. ;-)