Can someone tell me why my part density does not match?

I applied Aluminium material with density set to 2710kg/m3. So with a volume of 1m3, the part should weigh 2710kg.

Instead, I get 7771.626kg and my volume went up from 1m3 to 1.001m3

Without an assigned material, the part weighs 7770 kg, so it seems that by applying the material I increase the volume by 0.001m3 and 1.626kg.

Any troubleshooting suggestions are welcome!

 

Edu Part Design