I've noticed something interesting with the stats of followers.
If I give my Templar this amulet, his stats increase unexpectedly:
He goes from his original 55 Vitality:
All the way up to 118 Vitality:
Somehow, what is supposed to be a +25 Vitality amulet is increasing his Vitality by +63. This hugely increases his maximum life, so I'm not really complaining, but - is there any explanation for this? I've noticed it happens for other stats (tested for Strength as well).