Impossible to edit Rich Text in CMS

Dear Webflowers,
I have added a Rich Text section in my CMS, and now it is impossible to edit.

The text I have pasted in the section are now blocked.
Even when i Create a new page, I cannot paste or edit text within CMS section.

It seams to be blocked. Can someone help me please ?

Here is my public share link: LINK
(how to access public share link)

Please share your read only link so we can test the CMS on our end.