SAB 6.1 MAC problem app.Def file ? possible bug?

We found that when we removed a custom style called span.ram in SAB, and after that made a new differently defined custom style with the same name, the previous style kept coming back under the custom styles in SAB as soon as we looked at a book which contained that particular custom style.
Wehen we opened the app.Def file we found that the old style was still there and only after we manually removed the previous style with the same name form the appDef file, the old style stopped from coming back and only the new style was used by SAB.
This looks like a bug?

Yes it sounds like a bug. So were both custom styles in the .appdef file? I have written it up as a bug.

Yes, both custom styles were in de appDef file! Thank you for your attention …