>>>>> What should I be looking for in the annotation scale list?
SCALELISTEDIT command:
https://help.autodesk.com/view/ACDMAC/2021/ENU/index.html?guid=GUID-52B8B084-1DE0-403F-957B-EADD0856...
Do you see something strange / unusual in the Drawing scale list?

You can also verify supported scales for the selected annotative object:

- active viewport with problem dimension

- select dimension, right-click and select:

You should see Annotation Object Scale List Dialog Box:

https://help.autodesk.com/view/ACDMAC/2021/ENU/index.html?guid=GUID-1E3DCBD5-C0F1-4598-9408-B330636E...

Is everything all right there?

You can edit - delete or add annotation scales for selected object in this dialog.

Can you share your problem drawing (or part of it) here? I can look at it.