Thought I'd share a lesson learned
I noticed that I couldn't successfully apply the EMPHASIS MARKUP of ORANGE WAVY UNDERLINE while I was highlighting Jeremiah in the ESV today. The problem got worse and worse and spread to other highlighting in other areas of the text. While I was trying to better understand the nature of the bug, I noticed that (sometimes) the highlighting that I was applying in one place was instead appearing somewhere else--and it seems to be to a specific word in Jer 16:4 [GROUND].
I've included a screenshot along with red markup to indicate where I was trying to apply the wavy lines [and later test with OUTLINE] and where I noticed the highlighting actually showing up. I tried to turn off the column view, but the same bug persisted. I tried highlighting in the KVJ in the same area, but as far as I could tell it didn't work at all. I tried highlighting in my NICOT JER commentary, and that seems to be working.
All that said, I finally figured out what went wrong; I run Logos in four monitors. In this case, the HIGHLIGHTING tool is docked in a different window than I am doing my markup in. I mostly use keyboard shortcuts, except I ran out of alphabet so some things--like ORANGE WAVY UNDERLINE--I have to click on manually...in a different window.
The "gotcha" is that I was running ESV in a different window, and for some reason the above mentioned "GROUND" had been given focus at some point there. Therefore, when I selected something [BUT FIRST] that I needed to highlight with a style that required manual selection, what was happening was it was applying to the highlighted word [GROUND] in the ESV that was in the HIGHLIGHTING tool window. See screenshot:

I understand the "why" of the next part less, but when I changed from ESV to KJV and tried applying manual highlighting there, I didn't see it show up anywhere in the text...but it was applying to my NICOT JER. Best I can reason is that when I tested highlighting in NICOT JER, I'd left focus on a phrase there too--and for whatever reason, when I tried to manually highlight in the KJV, it choose to apply it in the NICOT JER where I'd previously had focus (instead of the ESV which also had focus...not sure why--perhaps that was the last pane I'd been working on in the HIGHLIGHTING tool window; my clue was when I tried to apply highlighting to to the KVJ, the Power Lookup reset to the NICOT Jer):

Moral of the story...when running multiple monitors, be very careful with what you leave selected across the monitors!