CMS Collections not showing up in Designing/Editing

I’ve set up my website on the starter plan with CMS items such as projects and blog posts.

I cannot seem to view any of my past CMS items any longer. When I do a live preview everything is still there but in the designer/editor backend, nothing shows up. When I click the CMS option the first time they briefly show up but disappear instantly.

Here is my public share link: