If the lines farther down the return are all correct, and you noted that you can see that a change to Schedule 3 Line 15 changes the balance due, then the program is calculating correctly and there may just be an issue with your display in Forms.
Overriding a calculation field in Forms is not recommended, as it may invalidate the terms of the 100% Accurate Calculation Guarantee.
Try exiting TurboTax, and launching the program again, allowing it to run any updates. If the problem persists, see this help article and this one for instructions on how to contact TurboTax customer support depending on which product you are using.
@db141
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