Error 403 in SP Page Builder

Hello, my name is Arturo, on Monday I acquired the personal plan, I have been buying your packages for a long time and I really like them, that is why I continue buying with you, however now I am having problems with SP Page Builder with the shaper_spectrum template when I create a new page and I add elements, it does not allow me to save them, it sends a 403 error, the problem occurs mainly on the home page, I duplicated one of the pages that did allow me to add and save but now it no longer wants to do so and I cannot move forward with my projects I download another template and the exact same thing happens. Please help me how I can resolve this detail.