Annular base plate weight

A simple question about the weight calculations performed by TANK.
If I wish to include the weight of the annular base plates, I think TANK only adds the weight related to the annular plates, but don´t eliminate the weight of the bottom plates that were initially in the position of the annular base plates. Is that right or is TANK giving me an extra total weight when the "include annular base plate details" is selected?

I know it´s not a big deal, but I have to explain it on the weight summary of my report.

Please correct me if I´m wrong, and thanks in advance.

Correct, TANK only adds the weight related tot he annular plates - nothing is eliminated.