The amount you are being taxed on as income on your W-2 is the difference in price you paid for the stock and the market value on vesting date (the employee discount, taxed as wages).
The amount you may get taxed on for your 1099-B is the difference between market price on vesting date and market price on sale date (generally a small amount) which is reported as Capital Gain, rather than regular income.
It's important that you enter the correct Cost Basis when reporting the sale of shares from your 1099-B.
You are not being double-taxed on the same income; it's two different 'incomes'.
Here's more info on RSU's.
@HerpDerpson
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