I have no other 3rd party applications installed that affect Windows performance or appearance, definitely nothing like ExplorerPatcher or StartAllBack. The problem usually happens after unlocking Windows or after I close out of a game (World of Warcraft, Ghostwire Tokyo). If I use the "restart Explorer" button in Start11, it corrects the problem until I do those things again.
I have Start11 configured as follows: Win10 style, taskbar enhancement on, never combine buttons, do not show seconds on clock, 100% solid (no transparency), left-aligned start button with replaced icon.
There are a ton of customization in Start11 but I believe most of what I have is default.