Replay rendering massive error

[GrcaTM]

first few times i tried to render some replays in stadium in mp4, it worked just fine, here is a link:

but few days ago idk what happened but now my replays are only shown on left side of the screen when i try to render them. when the render was done i entered the video and it was only on the left side of the screen, it looked stretched, and the right side was black. help