Thank you for getting back to me on this!
I tried setting the bounding box scale of those 3d models, but no luck. I even tried absurd numbers like 100, but to no avail.
Any other suggestions?
Yes, I used the bounding box scale ACE. Here is a screenshot of a model at the right border, with its bounding box scale set to 2x:
I've noticed that this behavior during runtime is very similar to what happens to 3D models in the layout editor. Here is a gif to illustrate what I mean (I'm scrolling the layout manually with the mouse):
I don't know if seeing the same symptom happening in the layout editor might give us any clue, but I thought I should include this. Perhaps this is caused by some project setting?