[hibernate-dev] ORM CI jobs - erroneous github triggers

The legacy ORM jobs (5.1-based ones at least) are getting triggered when they should not be. Generally they all show they the run is triggered by a "SCM change", but it does not show any changes. The underlying problem (although I am at a loss as to why) is that there has indeed been SCM changes pushed to Github, but against completely different branches. As far as I can tell these job's Github setting are correct. Any ideas what is going on? This would not be such a big deal if the CI environment did not throttle all waiting jobs down to one active job. So the jobs I am actually interested in are forced to wait (sometimes over an hour) for these jobs that should not even be running.