Are you using the controller interface? Or is it mouse and keyboard?
I know for controllers on patch 8 (and thus console players get this a lot), the game can lag something fierce when hovering over attacks and actions in the radial menus, especially if - as you say - you do this while the cursor is on an enemy or character.
I've been told they're aware of the "radial lag" issue so hopefully it'll be fixed soon... hopefully! Lol.
