Looks like you have discovered the mysterious extra non-selectable nodes as well.
http://archicad-talk.graphisoft.com/viewtopic.php?t=50310
I have no idea why your plan is zooming to 0% when changing views unless it is to do with the view settings.
Try changing the 'Zooming' option so it is not set to 'Fit in Window'.
It is odd because if you manually click the 'Fit in Window' button it does not zoom out to 0% - you have to manually scroll out to get that.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11