Currently, for AMP pages the URL gets extended by an amp/ (https://github.com/pluginkollektiv/statify/blob/develop/inc/class-statify-frontend.php#L428). However, this will result in wrong URLs since https://example.com/ will become https://example.com/amp/ in the database. The correct way would be to add an ?amp or &amp to the URL to get a valid URL, which is the AMP variant of the page.