Word bullet formatting changes in various sections on same page

Hello Matthew_Katz ,

not sure what steps the MS support did, but when I have a problem with styles not holding, I know my MS Office installation is corrupted and I reinstall Office. Not via "Fix...", but a complete reinstall.

To troubleshoot the issue I first try to import the styles from a template/document I know has never had the issue. If that doesn't help and the document still misbehaves, I go directly to reinstall.

I now balance the effort/result scale: I stopped searching for the "why" and go directly for removing the issue, as searching for the why is for programmers and I am not one. That said, however, I am talking only about the Office 365 as it is this version that frequently manifests the issues you are describing. 

I am aware that this may not help your particular case, though, but I am adding it in case it might. 

L.