This is the first time I've seen it in stats. It pops up in my life sometimes when I'm getting thwomped and about to die. Some sort of rounding issue?
Confirmed that 28 is the correct number from gear.
Edit: Changing zones / camping didn't change it. Unequipping my 10 leech gloves set it to 18 correctly but it goes back to 28.000 when I re-equip them.
It could either be the leech breaks a threshold or an issue with the gloves. The gloves are Friar's Epiphany.
Edit2: New item pushed life leech to 32. I can leave gloves equipped any unequip another item to drop it to 26 and it works. No clue, seems like an issue with 28 specifically for the moment. Probably not worth fixing if it's not obvious.