UPDATE - got it working -
There may be compatibility issues, but the good news is with a little luck I got things back to normal.
I did a bunch of things. I think the first thing I did was try the Terminal command to reset the dock.. it didn't seem to do anything.
Then I moved the com.apple.dock.extra.plist and com.apple.dock.plist to the desktop and logged out. It reset the dock to factory and I hated it. So I moved them back and rebooted. Well THAT was not cool. I lost the Finder and a bunch of other stuff that I hadn't expected even on the laptop's display! I did a bunch of shut downs and it seemed to get a little better each time.
I removed all the invisible items from the list and then re-added them after all these reboots and shut downs.
My dock is back to normal across all the screens now.
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