Why Does Bounciness Affects Rigidbody Velocity? (SOLVED)

Hi, I'm working on a project which makes use of quite a lot of physics provided by the engine. I made it so that an object applies to damage to another on collision. this damage is calculated by multiplying rigid body mass by rigid body velocity. I was running into problems where an object with lower mass would do substantially more damage than heavy objects so I did some playing around. Turns out that bounciness affects the velocity. e.g. I had a rubber ball with a mass of 1 and bounciness of 1 (max) do around 4 damage, while a stone with a bounciness of 0.1 and mass of 10 do 0.7 damage while they fell from the same height.

I wanted to ask if anyone knows why this is or if there is a way to disable it?

Thank you in advance :)

Edit: I fixed it by using relative velocity instead of rigidbody velocity.