Why is readymag making me pay to publish my website

to my knowledge, i didn’t use any paid features, and the site is under ten pages using a free template. i don’t have any other published projects. when i try to publish, readymag tells me to unpublish an old project to upgrade. i even tried upgrading to the most expensive plan and it still wouldn’t let me upload my website, so… does anyone know how i can see what’s preventing me from doing so?