I'm having an issue with columns still showing up in the survey data tab / downloaded CSV file even after a question is deleted.
See "ok" column in picture below.

It's not in the survey, or the schema.


The only way I've found to get the data page to update is to publish the survey clearing the previous collected data.

Unfortunately it seems like the only thing I can do to get that prompt is to add a new question, otherwise I get the message that it'll be uploaded without affecting the existing data.
I've manually deleted the results and republished the survey, but it still retains the column.
Ideally I would like to be able to get rid of the column... but an easy way to clear previously collected data would also be nice.
Thanks for any assistance.