So, I've been editing my new montage lately, so I've finished everything, it was time for me to put black images(single colored) on some of the beats, I've timed every beat, but I just noticed this now, whenever I put a black image, it doesn't fill the screen, even tho it's the exact same resolution as the video itself.
Here's a picture of my problem:
https://i.imgur.com/cGRLq2o.png
If somebody has a solution to this problem or knows the cause of it, reply here.
//EDIT:
I'm editing the video on 800x600 4:3, and the black images are the exact same.