"Update Hole Series" -- Hole Series is Constantly Out-of-Date

I have a particular assembly with a hole series that is constantly out-of-date. I open the assemly, update hole series, save & close. The next time I open the assembly, the hole series is out-of-date again.

I have not seen this with any other assembly to date. Is this a known bug and/or is there a fix for this?

Not going to lie, this is driving me insane. It worries me that a part/assembly I have designed is randomly changing itself outside of my own CAD decisions.

Just another one of the Solidworks bugs to add on to my list...