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While modeling a gun in Blender 2.9, some parts of the faces are drawn weird in wireframe mode.

Example 1:enter image description here

Example 2: enter image description here

I then try to create a face using these edges (done automatically when I'm subdividing but I noticed it when troubleshooting the problem)

Before creating face: enter image description here

After creating face: enter image description here

It would be very helpful if someone could not only help me fix this issue, but give me some pointers on how to avoid having this issue in the future. Thanks :)

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This is because faces are not meant to be bent. All polygonal faces are secretly changed into triangles in the rendering engine, so if they are bent, it will split them arbitrarily. Create multiple faces one at a time, working your way around that corner. Select three or more vertices, and even if an edge to make them a face is missing, it will be auto-created.

Also, the top and bottom pre-existing faces seem to have mismatching edges round the corner, as in they are not exact copies of each-other and the differences seem random.

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    $\begingroup$ That worked, thanks! $\endgroup$ – LunaSol Mar 1 at 5:05

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