When I log into any world, even worlds previously unaffected, the render seems to glitch out and replacing a portion of the sky with textures that were previously there.

I know that doesn't make too much sense, but I'll put either a photo or a video to help resolve this. 

Again, I believe it's a rendering issue, but I am not sure. 

I have tried to change my render settings but the glitch still occurs. I pretty sure it's not my computer as all my other games do not any sort of rendering glitch.

I'm sorry for the poor video, my computer doesn't like things open when I'm recording.