I am managing a document which is being worked on by multiple authors from multiple geographical locations. We have had some horrendous problems with list styles and other formatting being totally messed up people simply writing content, with pre-set styles being changed even though the "automatically update" box was not checked.

I have just spent a lot of time carefully creating a new template with pre-set styles, then restricted formatting to these styles. When the document is locked in this way, I cannot make any changes to the styles.

However, I have just found that the same user whose edits were resulting in a lot of the problems has again managed to accidentally/automatically change a style - the Normal style. It had had numbering added in. I temporarily unlocked the document and changed the style back, but my understanding was that by restricting styles, absolutely NO ONE could apply direct formatting or change a style itself without first entering a password to unlock it.

As I know this user is not hacking the protection, or deliberately trying to change styles, what is going on??