You need to go back through the entries you made when you entered your K-1 into the TurboTax system. If you have positive numbers in box 14 then you should have self-employment tax.
If you can't figure out where the error is you are probably better off having someone walk through the return with you to look at your entries so I recommend getting live expert help.
Here is a link to finding a TurboTax expert.
However, that requires upgrading your product which may be an expense you don't want. In that case you can call an expert and ask questions over the phone.
Here is a link to the TurboTax Phone Number
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