Seems like you have re-deployed your survey form 84 times. Please see the image below:
Though your current survey form (questionnaire) does not have the miss-matched code at the moment, it should have been uploaded at some point of time during one of the re-deployments you have made in the past. Thus this is the reason why it is still here. Maybe you could try it out yourself in a demo survey project.
Thus as a workaround i would advise you to track your re-deployed forms (questionnaire) and see on where you have used the miss-matched code. You could then make changes in the dataset (while cleaning your data).