Brokerage Incentive drove me to Schedule C

I received a brokerage incentive of $3500.  It was reported on a 1099 Misc and I in turn put it into TT Deluxe.

It was listed as 'Other Income'

For some reason TT started/completed a Schedule C and now says I should pay $700 self employment tax.

 

I must have done something wrong her but I cannot determine what?

 

Any help would be appreciated.