Your site is using:
WP 6.3.1 with PHP 7.4.33
Patreon WordPress 1.8.6 with API v2
Patron Plugin Pro 1.5.6
Patreon Button, Widgets and Plugin 2.1.9
When a Patron clicks the Login with Patreon button, they login to Patreon and are immediately brought to a signup page for the minimum pledge level for the page they are on. This happens even if the Patron is already a member at a higher level.