I created a first person camera and movement system just now, and I noticed an odd glitch. Whenever the tilt of the camera is 0, 90, or -90, certain blocks begin glitching.
Here's an image. Here the camera.tilt is -90, and I'm by the corner of a wall.

When the camera.tilt is at 0, the floor begins glitching (I assume the ceiling would too, if there was one), and when at 90 or -90, the walls do the same thing. Clip_near of the camera is 1, if that matters, but setting it back to 15 doesn't help. The arc is at 100, but setting it to 70 doesn't help, either. Why is this happening? I hope there's a fix, because it's a very easy to spot glitch.
Thanks in advance!