My theory: In my bi-weekly paystub I was making 401K contributions and Employer match to a 401K. My employer changed providers of the 401K. When that transition completed, I closed the old 401K account. And my hunch is that what had been going correctly to that old 401k account, was re-categorized as some sort of hidden asset in my checking account (the account balance was correct, but in the networth report, the value grew (retroactively during when old 401K was active). I'm happy for just a bandaid fix for this—a hack—like adjusting the value without adjusting the account balance at the time that old 401K was closed.
I'm classic quicken on a windows laptop. I'm up to date. And this problem has been around for more than a year, and I'm just now needing to clean this up.