BUG: hidden securities appear when they shouldn't

I can get into a situation where the Security List shows hidden securities when "Show hidden securities" is un-checked. It's randomly repeatable.
I've been going through the list hiding old bonds & CDs which I no longer hold. After several iterations of hiding these old securities, hidden securities spontaneously appear despite the check box setting. Then I have to check and un-check the box to make the hidden securities become hidden again.
This is QWin

Quicken user since version 2 for DOS, now using QWin Premier Subscription on Win10 Pro.