I think something is messed up with Freya, she's somehow healing for more than she's dealing damage with Lancet. Not sure what esper or jobs are in play, though.
Lancet got a buff recently and from my tests is doing 50% of damage dealt as healing, with siren that is becoming 75%. With ranger making it hit multiple targets makes you heal alot more than the initial target took. Maybe that's what you're noticing? The same came be done with Firion's blood sword for example although this heal from blood sword isn't displayed with numbers.
So i've only been able to replicate this myself on a very high ng character, someone else i've seen using freya also heals more than the damage they deal, and you. Nothing we have in common other than freya. I wasn't able to replicate this on ng 0 though so maybe the ng cycle has something to do with it, what cycle are you on currently? I think it's due to defence, lancet heal scales with the attack stat itself and not damage dealt. So as you get to the higher ng the damage you deal is reduced by defence but the heal will remain consistent. This is just speculation though, i am just a fan of the bot not a creator.