Microsoft Forms incorrect graph bug

You will see from below image that the graph says there were 9 responses. Yet there were only six.

The form can be accessed here: https://forms.office.com/Pages/DesignPage.aspx#Analysis=true&FormId=ND7BLz_wi0mYKny0RuJbxrpokkskeLVFq_OJ2lLBNuBURDBTN0FKMTZJVE5OQkI1NFQyTjhTVTlXTi4u