Question about relic stats and crit damage scaling

Maksik666

Hey everyone, I’m a bit confused about how relic stats are calculated.

My 7 Star Rank 2 Silver Surfer does 3023 damage on a crit. When I equip a 7 Star relic that gives +37.77% critical damage, the crit only goes up to 3220.

That doesn’t look anywhere close to a 37.77% increase. Am I misunderstanding how crit damage scaling works? Does the bonus apply differently (like to a base multiplier or something else)?