Yes, there were changes. Just to be sure, here’s the process.
1. Change CSS file. Commit and push.
2. Add another change to CSS file. Commit and push.
Then revert back to the first commit.
In doing some underlying research, I discovered that the CSS did revert back to the first commit in the actual CSS file, it just didn’t do it in the child theme custom css input area in the dashboard. So, might not be an issue with your plugin.
Have you experienced this before? Thanks.