Here is the technical view mode:
And here’s the shaded view mode:
Wireframe mode where you can sort of make out some of the objects from the first screenshot:
So I recognize the objects in the technical mode, and they’re a part of the model but that’s definitely the wrong place for them!
I also have a similar object on top of the model, so it’s not just on the ground plane:
EDIT: I found that moving the objects with the projections on them and then hitting undo can sometimes clear the ghost lines, but then they can instead appear on other objects!