The error occurs when you file the return for one person and not for the spouse. In Profile you indicate the income for the spouse for whom you are not filing that their income is $100,000 (or any amount large enough to eliminate a spousal amount claim). The program will correctly show on line 30300 a nil claim for spouse. On line 58120 (On428), the program generates a spousal amount.
This occurs in multiple years of filing.