Gohr's Grip WW unique has a 2.309x damage multiplier that I cannot figure out

On the PTR I saw some insane damage numbers for pure WW (>600B), so I’ve tried to figure out what changed. While doing that, I found a 2.309x multiplier (130,9%) in season 9, that I cannot identify.

Anyone did some testing with Gohr’s?

I can calculate the base damage of WW (crits, vulnerable, etc.) with very high precision, it almost exactly fits the numbers I see on screen (test dummies). But for the Gohr’s Grip explosion, there is another 2.309x multiplier that does not change with skill ranks or any other properties of the character (additive damage, str, multipliers etc.).
The only thing I have not tested is the variation of Gohr’s unique affix. My gloves had 600%.

Notably, Gohr’s explosion does not work with Ramaladni’s, so initially I didn’t really notice the multiplier, because it canceled out the Rama buff, but when I switched to 2h mace WW, it suddenly became very obvious.
At some point I thought Gohr’s was taking the bleed part as additional damage, but no matter how I tried to put this into the formula, it never really worked.