Help asap! for final!

HELP ASAP! Hi all, I’m struggling with my clipping plane in the images shown below – it shows differently in perspective vs top view even after restarting the application and remaking the clipping plane.
Additionally, how can I remove these top left rectangle’s bisecting lines on a surface made from 4pts? Extruding a rectangle isn’t working because a tiny part of my dimensions are off on my model, but I need it to appear as a solid color for printing!

I can’t spot the difference from your picture. Care to explain?

i dont get what your issue is, i just guess, clipping planes have to be set for each viewport seperately, in your clipping plane settings