Your W-2 does not say you made money in both states. It only says you had income tax withheld for both states. You employer did it correctly.
MD & WV are "reciprocal states". Once you moved to WV, you employer shoulda stopped withholding MD tax and started withholding WV tax. You are now only taxed, on wages/salary, by WV, not MD. Staring in 2021, you will not longer file a MD tax return.
