Weird wireframe display on viewport when in camera (or certain angle maybe)

It happens with a certain camera, but it is not like this in perspective view, and I do not think this is overlapping vertices.

May I know what might solve this? I need to show this to my school's presentation and I want my wireframe in my OpenGL render to look clean.

enter image description here

enter image description here


marked as duplicate by Duarte Farrajota Ramos, Mzidare, m.ardito, Ray Mairlot, X-27 Sep 30 '18 at 23:21

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