Two things. First, you need to report this properly as a gambling winnings. To do that on your tax program, tell the program you have a W-2G and provide the information on your gambling winnings and losses. The program should correctly handle the gambling winnings from there. Unless you had withholding from the gambling winnings, the fact that you have a 1099-MISC rather than a W-2G won’t affect your return filing.
Second, you should go back to the issuer and advise them that they should issue you a corrected 1009-MISC (to change that to zero) and instead issue you a W-2G. It is important that they issue you the correct tax document, both for them and for you. If the IRS sees that 1099-MISC and no self-employment income to account for it, you can expect to get a letter from the IRS in about a year proposing additional tax for the self-employment income that it looks like you received.