I am pretty sure that MediaWiki itself does _not_ contain a functionality, which would do automatic reverts.
There are some extensions, which can be used to do automatic reverts (and if these extensions are configured incorrectly, they could show the undesired behaviour, which you see). One of these extensions is Extension:AbuseFilter. However, if you do not have any extensions installed, then this cannot be the problem.
The log excerpt, which you posted, only contains hits, which have been done by one and the same user. To me it looks like this has happened: The user visited Special:RecentChanges and then he hit one of the rollback links, which are present on that page. At least judging from the URLs, which have been requested, this is what happened.
Based on these observations, I would expect that, if you do _not_ visit Special:RecentChanges, _no_ rollback occurs. That mightbe a workaround until the problem is really solved.
Does that happen for _all_ users? Or only for some?
Do you maybe use some JavaScript, which automatically clicks certain links for you?