This may not be a 4k issue. I had this issue when I first used the software on a sub-1080 monitor. I can't remember what fixed it but do make sure you have fast

This may not be a 4k issue. I had this issue when I first used the software on a sub-1080 monitor. I can't remember what fixed it but do make sure you have fast type mode enabled in your settings, or whatever they call it now.