I tested it and also got this problem. I noticed that this only happens if:
1. You have "preview effects" option on
2. Depending on the zoom, your objects are at the bottom of the editor
3. If you try removing the "SetColor" effect found in "PlayerFont" and "LimelightFont", the problem still persists
4. If you delete the "Select number of players" text on the top, the problem stops completely (so weird)
https://a.pomf.cat/raegom.mp4
That being said, I also tried it on my IntelHD5500 and it works perfectly, so I can assume it's a Nvidia driver issue.