Ortho Viewport is rendering some hidden/covert Edges in Edit Mode For some reason, part of the Edges that are behind Geometry, still get drawn in the scene. The object neither has XRay enabled  nor is "limit selection to visible" active. "Backface Culling" also seems not to be the problem. This only appears in Ortho View and not in Perspective View. Any ideas?
Perpective View:
The problem is the clipping. I'm not sure whether it's a bug or not but lowering the end value solves the issue. Your clip value

lower clip value