Amazon Vine 1099-NEC Effect on Federal Refund

First document I entered was the 1099-NEC I received from Amazon as a part of their Vine program.  The listed amount was about $1,100. 

 

At the time TurboTax was showing a refund due from Federal.  When I entered the 1099-NEC, the refund amount went down.  Calculating the effective tax rate from that one action, the 1099-NEC is being taxed at an effective rate of 36%. 

 

Does that sound right?  I was expecting to be taxed somewhere in the lower 20's. 

 

thanks