When entering full screen in safari video distorts

So this issue has been happening for a few months now. I was in the beta program for Sierra, and High Sierra OS when this problem started. I un-enrolled from the beta program and installed the regular version of High Sierra and the problem went away. After an update a few days ago the problem came back. I'll try to explain this the best I can. when i'm on youtube or other websites where full screen is available the video will basically go diagonal. It doesn't always happen but it does about 60% of the time. if i move the cursor it will look normal but then goes back to being distorted. It's really annoying, I reset the PRAM thinking that might help, but it still happens. It was fixed after I initially left the beta program and installed a normal version of Mac OS. But now after the last two updates 10.13.4 the problem has come back. I've also noticed on youtube if i change the resolution to 1080p, or 480p the problem usually goes away, it's mainly on 720p videos that the issue happens. I tried to take a screen shot but it did not capture the problem correctly, so I had to take a picture. If you need anymore information let me know, thanks again. It's really frustrating and any help would be great!