Coursepress - limited questions per unit

Hello. I'm trying to make a course with a single unit with many questions (for design reasons). After some 47 questions, I can't add more questions or pages. When I try, it silently fails. Sometimes the additional question just isn't there, and sometimes it does appear in the back end, but without the answers I included.

Also, these additional questions aren't deleting properly. When I delete one and refresh the page, or when I add another question, sometimes the original additional question will reappear in the back end.

I created a course to demonstrate this
If you look in the backend, you can see the final question has no answers, and even the input fields for answers are missing.

I tried disabling all other plugins. I have updated to the most recent version of coursepress. I have granted you support access through the WPMU DEV Dashboard plugin.

Thank you