Replay Gain - Leftover Albums question

So, when I select the setting to calculate album’s replay gain, you can select all the albums in your library…

Mine ran, and every album seems to be using RG just the way I thought it would.
However, I have one album that stays in the list of albums that needs to be analyzed and never leaves the replay gain menu list.

Any reason an album would not clear from this list?
Only one in my entire 5000+ album collection that does it.

Curious.

Any info would be helpful.
Many thanks.
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Screen Shot 2019-04-23 at 12.02.31.jpg
Screen Shot 2019-04-23 at 12.00.37.png