Screenshot:
https://postimg.cc/pyxGKJwf
In Benkongerike Great Hall, two of the quills placed on a crate (0403539E) will clip into it. The other three are floating slightly. I'm not sure how much can be done, but it may be possible to make some minor adjustments to at least prevent what is shown in the screenshot from happening.
Clipping quills: 0403AD6C, 0403AD6E
Floating quills: 0403AD6A, 0403AD6B, 0403AD6D