There is no glitch. I started a new return, but this time using a single person and came to the same conclusion as previously answered. (Refer to the link below for the previous reply).
Can you please try to toggle the button in S14, you will see that the amount adds or removes itself from the form. Which translates to the T1 line 449 accordingly.
Previous post reply: https://turbotax.community.intuit.ca/replies/3766098
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