Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
I have 1 scout and 1 adult where I have the yellow caution flag next to their name in scoutbook. I checked my scouting roster and they are both listed there with matching data.
I have tried the suggestion of unapproving their membership and then re-applying after 30 seconds. It did not work.
Scout: Initial: EN Memberid: 13918736
Adult: Initial: JK Member Id: 115063836
I also had two other adults that had the same flag under 2562. I just removed their membership, since I will be removing them from the charter in 2022.