Unable to remove security question

Unable to remove security question

Good Morning,
 
We are about to make ADSElfService live in our environment, and we were able to add our own custom questions, however, we are not able to remove a few of the questions (ie/ favourite colour).
 
When we try to remove it, it comes up with the following message "Deletion Cannot be performed.  Security Question in use by a User."
 
There were only 3 of us enrolled at the time and we all went in and changed the questions, so not sure why this is an issue for us.
 
Is there a way to manually go in and remove this question for someone who has it stored?
 
Thanks!

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