Why doesn't Opencart 2 save module changes after migrating to https?

Question

opencart

The essence of the question is in the title. Connected https to the site. When you try to change something, the page is simply updated with the old data. I can't change anything on the site now.

Answer 1

somehow there is little information again ...
maybe the problem is

Connected https to the site

opencart works fine with https,
as an option, something may have been underwritten in the opencart configs and opencart itself believes that the site works on http, by the type that a request with post data is sent to http, in turn, htaccess redirects to https but without post data .. ..