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IRS form 1099-K may report income of different kinds.  Is self-employment income not correct?  

What is the nature of your sale of sports tickets?  If self-employment is not correct, is your sale of sports tickets a Hobby?  Or reported as a Personal item sale?

Self-employment is one of the kinds of income that may be reported and may be appropriate if you are in the business of buying and reselling sports tickets.

However, you may want to delete your IRS form 1099-K entry and your IRS Schedule C entry and re-submit the IRS 1099-K information.

See also here.