Cristián Lávaque on "[Plugin: s2Member Framework (Member Roles, Capabilities, Membership, PayPal Members)] User Roles still exist after deactivation and deletion"

Webgirl is right.

Try to reactivate s2Member, disable the safeguard, and then remove the plugin again. WP Admin -> s2Member -> General -> Plugin Deletion Safeguards

I hope that helps. :)

Cristián s2member.net