Priorities sometimes don't show up in building information dialog sometimes

This is a storage bin that's been assigned to store shove vole eggs.

Note that there is no priority associated with this bin.

If I exit this and click on the priority tool I find that the priority is 9.

I do not have any idea what caused this.

I looked at several nearby things after this, including a couple of critter drop offs and a telescope.

Their priorities weren't set, either, but after three or four I saw one with a priority set, at which point everything had its priority set.