If you have a problem then make a thread in script support with your issues.I'm using the scripts of CP's Battle Engine, on mode 3. Is this the problem?
If you have a problem then make a thread in script support with your issues.
Here https://forums.rpgmakerweb.com/index.php?threads/yanfly-damage-popup-1-0-4.12151/post-351557
It is said that they used Neon Black's Battle Popups as there was an issue with CP Battle Engine.