Baseline Shift Mystery
InDesign 15.1.4 on Mac OS 12.2.1.
I'm cleaning up some inconsistent text, and to check if everything is the same, I select a paragraph and see if any of the fields are blank (meaning mixed values somewhere). So I decided to check the whole story for baseline shift, and saw that it was applied somewhere, but when I tracked it down, this is what I found.
This character doesn't have any:

…and this character doesn't have any:

…but when selected together, I would assume that the baseline shift field would be the same as the first two, but it's blank:

The font is the same, the size and leading are different, and the $ is using only the Superscript button. Is this just a bug in the file (I can't replicate it in a new document), or is there some setting I'm overlooking?
