I have a user who is not a project admin who is showing that he made changes to the user Roles and Permissions. Talking to the user, all that he did was open the Roles and Permissions screen. As he is not allowed to make any changes, he did not. But in the Send/Receive report for Recent Changes it shows that he did.
You will also note that it says that he made changes to the Progress and Renderings. Again, he just went in to view the Progress and Renderings.
There are two issues here. First, it would be good to fix whatever is showing recent changes to not show changes if no changes were in fact made. Second, for things like Roles and Permissions it would be helpful if the Recent Changes screen showed what changes were made just like you can see what changes were made to a given chapter or verse.