I visited … nothing I seems to do fixes the issue. Everything appears to be correct. All the roles have the correct capabilities, yet, it appears only admin roles can add/edit entries. You only have a few plugins installed, but could you deactivate all plugins except Connections and Link to see if the issue persists? Another thought, did you perhaps make any alterations to say maybe the
wp-config.php file or anywhere else that limits the access to the admin in any way?