General Recovery Time bug?

Not that I'm complaining at all about this.

But I just noticed my generals with First Aid skills, recovered from battles on sacrifice waves faster than generals without first aid.

Vargus and ****, both have first aid booked.
Nus, does not have it at all. She has has 1 hr and 8mins remaining and vars and **** does not.

(just noticed this so I didn't test it out fully)

I had a MMA with 3 books in first aid and 1 MMA with nothing in it. Both was sacrificed with 1 recruit to the witch tower, and 1MMA is currently recovered while the other MMA has 1hr and 8mins left.