Update: This was resolved in an update delivery on 01/31
Within the 982 entry menu for TaxSlayer Pro Online, Line 10a is shown twice as shown below. This is simply a display issue we are working to resolve. The second Line 10a field is for Line 10b (Applied to reduce the basis of your principal residence). Your entry on the second Line 10a will carry to Line 10b on the 982. We do apologize for this display issue.