Okay, I figured out the issue. It will be fixed in next patch.
Basically game misses some items which should be equipped on your slaves. Not sure how you lost them. You can try manually edit out the gear equipped by said slaves in notepad.
Thanks, BTW I love this game, thank you for the hard work.
You were correct, I just copied the gear of a working slave over the gear of those that did not and that fixed them, thank you.
