What is the relation between effective mass and majority charge carrier

I am studying a semiconductor. My System has n-type dominating character.
I am getting effective mass for top of the valence band (VBM) as 5.04 while for bottom of conduction (CBM) band it is 0.20.

My question is:

Is it okay to have higher effective mass for the VBM where my system is showing n-type character?