The software did exactly what it was supposed to do when you weren't certain if you were eligible for the amount, it entered it because you were eligible as seen below. When you chose that you no longer wished to receive the amount it took it away after you said NO. If you would not have been allowed to receive it, it would not have been entered.
According to Canada Revenue Agency, you can claim this amount if, at any time in the year, you supported your spouse or common-law partner and their net income from line 23600 of their return was less than your basic personal amount (plus $2,350 if they were dependent on you because of an impairment in physical or mental functions).
The spousal amount is automatically calculated by TurboTax. You can see how much you are getting by looking at line 30300 on the Detailed Tax Summary.
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