After the March QoL Update, Deerclops does 120 damage to both mobs and players while it was 75 to players and 150 to mobs.
First I thought this as an intended feature but Winter's Feast event Deerclops's laser attack does 60 against player and 120 against mobs, so it looks like just a bug which Deerclops's PvE/PvP damage difference isn't working correctly.
This is the footage that shows this bug; the sweep attack does 120 damage to both players and mobs, while laser attack does 60 to players and 120 to mobs.
2022-03-25_18-11-43.mp4