It could be due to many reasons. First of all, canceled, forgiven, and discharged debt is considered taxable income unless it qualifies for an exclusion or an exception. Did you enter your information correctly in the amendment section? What kind of debt do you have? I am attaching the following information for your reference:
https://ttlc.intuit.com/replies/6602208
https://ttlc.intuit.com/replies/3300645
