At this point, it is difficult to determine who is at fault for the incorrect formula being applied. Your return was filed and accepted by the State of Missouri and any adjustments made, after the filing date, by the State of Missouri was corrected to a satisfactory outcome.
When Turbo Tax submits a return to the state and it has been accepted by the state, it doesn't correct or refile the return because from that point on, the return is the state's responsibility. If the return was rejected by MO, then the issue would have surfaced and Turbo Tax would have given you a heads-up on the issue.
@ShowMe1962
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