Save/Update apage

I user grav the second time.
it is a very n1 CMS.

But i have a problem with my site page.
I have a page blueprint and when I create the page works the save, if I want to edit and save the page but nothing happens. Grav, however, informs me that the page has been saved successfully and then loads the text back into the fields before saving.

Here my page blueprint.
What’s the problem?