I would prefer if you didn't show the log to the whole world, please. I include the log for you to read, but no need for the whole world to see it, if you don't mind. Thank you.

As you will see, I had a 45 damroll. Thrakazhaar gives me a sapphire bracelet, which I swap in for a wide copper. I check my score and now have (as expected) the 40 damroll. A little while later, I check my score and I have a 39 damroll. I did not change any equ, clothing or weapons,

Nope. You switched weapons.

I did not lose any str or age, I did not have any affects, nothing. Spoke to an imm who didn't know what it was and suggested I post the log here. I'm sorry it's such a long log, but that's the interval between my typing "score".

Editing this gigantic-ass log down to the important parts.

sco
Eulinda GreenFeather the Piercing Claw of War, Veteran of Battle
*snip*
Hitroll : 28 Damroll : 45
*snip*
You stop using a wide copper bracelet.
*snip*
You wear a sapphire bracelet around your right wrist.
*snip*
Hitroll : 33 Damroll : 40
*snip*

<1050hp 638m 718mv 24350tnl (-26.49%)> wield sacrifice
You stop using an envenomed dagger.
You wield a bejeweled sacrificial dagger.
A bejeweled sacrificial dagger feels like a part of you!

<1050hp 585m 846mv 24350tnl (-26.49%)> sco
Eulinda GreenFeather the Piercing Claw of War, Veteran of Battle
*snip*
Hitroll : 33 Damroll : 39
*snip*