RSU Grant and double taxation?

I have RSU grant of 50 shares and 16 were sold to cover taxes. Remaining 34 I sold and now amount is  appearing on my W-2 along with my annual salary.  But there is no entry on my W-2 for 16 shares that were sold to cover taxes in tax section. Am i paying double taxes? First at time of vest and second time as it is added on W-2 caused higher tax bracket but no information of 16 shares that were vested to cover tax?