Items disappear when changing display mode

Hello I've been having this issue for a while, tried everything from re-installing & also deleting preferences but it's not working. Many elements of my work go missing on my documents, both on normal and preview mode. Is this a bug? You can see the elements disappearing and also inside the red areas there's supposed to be a vector which is not appearing in both cases. When I export the Pdfs they have everything on it so it's just a display issue.. but I can't keep working like this, sometimes I have to move objects within the area and I can't see them.. it happens with various files.

I'm attaching a video here to show you my problem.