1 hybrid, alone, came in and exploded. That was it. I think they might need a buff, at least on this difficulty. Then again, It's only Regular Hybrids, so that might be it. Also, I had just opened a Mk. III Zenith Reserve and smashed up some hybrid facilities.
EDIT: The hybrids are really acting oddly. They run into my system, fire off a volley at the nearby turrets, then chicken out and run back. They don't have subfleets or anything. It's really wierd.