Use the "Delete a Form" tool to
remove the Form 8582 (and any
associated worksheets).
See: How do I delete forms in TurboTax Online?
After deleting the Form 8582, log out of the
program. When you log back in, use the Delete a Form tool to confirm
the Form 8582 has been removed from the list of forms in your
return.
Why does this happen? Once you enter (or import
or transfer) certain information, the program creates or updates forms and
worksheets that use that information. In your case, the program created a new Form 8582 for this tax year (2017) because you had one for last year (2016).
