No you're not seeing things, it happens on everyone's game. I belive that CPU characters can do this as a handicap for being useful. A good example of this is in the quest "From the Depths" with the crazy force, she doesn't physically have to hit you to make you guard or do damage, she just has to swing. If it's not because of CPU handicap then it's just a glitch. But either way, it doesn't really make a difference seeing that CPU characters never do much melee damage to you or enemies.
PSU Character:
Izurei - Level 50 Cast, Rank 10 Ranger/Rank 3 Force (Future Guntecher) - Universe 2 or 15
Izurei - Level 50 Cast, Rank 10 Ranger/Rank 3 Force (Future Guntecher) - Universe 2 or 15