I have a part that i use to practice for a certification test, every time i design it i get different weight

i was trying for practice CSWP certification test, and i am using some practice test for that, every time i design the same part with the same exact material type and same dimension i get over 100 grams different.

i also noticed for an unknown reason that under solid bodies tab there are two bodies in a part that should be one solid body.

is there a reason for this difference ? i have never encountered this issue before.

SolidworksParts And Features