Browser-based editing causing styles corruption?

[Peterson]

I recall reading -- likely here -- about browser-based editing causing corruption. I'm unable to find the thread and have an issue where a bullet list style became corrupted after authors edited via browser.

I'd be grateful for a link to the post or to other information about how browser-based work can cause corruption.

(The odd thing was, the corruption created lettered elements in the bullet list, which I've never seen before. Also odd was, the usual fix -- copying an intact version of the style back in -- didn't work.)

Thanks