Instructors can submit answers to poll multiple times and cannot clear answers

As an instructor, you can create a question in lessons and submit an answer multiple times. There is no way to remove the submitted answers. 

Steps to reproduce:

As an instructor, go to Lessons

Click Add Content, then choose Add Question. 

Create a multiple choice question with possible answers, Click save.

Go to the question, and show poll. It should be 0 for everything. 

Then choose an answer, click submit, show poll. 

Instructor can then submit again, even though the Submit button is grayed out.

The poll will continue to record submitted answers from the instructor, but cannot be removed