Looks like you have discovered the mysterious extra non-selectable nodes as well.
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.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10