If I already paid tax by selling RSU on the vesting date, do I still need to pay more taxes when I report my 1099B? I did not sell anymore RSU besides to cover tax.

Some RSU were sold to cover tax on the vesting date, but the total vested amount still seems to contribute to my annual gross income and taxable. It seems like I’m paying taxes for both the vesting of my RSU on vesting date plus the total RSU amount as income on my W2 even though I did not sell any additional RSU throughout the year. 

Appreciate any help.