Good morning, @cmwarren ...
While I have never used CK-12 myself, I do know that it can be integrated with Canvas. See the CK-12 info page on the EduAppCenter. Since the screen shot that you shared with your question does not appear to be a part of the Canvas interface, I would recommend that you reach out directly to CK-12 technical support ... as they would be the best ones to help troubleshoot this issue with you...since it is their product. There is a Support e-mail address listed on the page that I linked to. I also found this help page for you off of the CK-12 home page: Help Center.
I hope this info will be of help to you. Good luck! Take care, stay safe, and be well.
