ive reset this plugin yet I'm still getting an issue

ive reset this plugin yet I'm still getting an issue whereby , Join membership box with signup appears a) before the registration form, as should be b) after the registration form c) after the signup summary - and I get a loop between complete signup, and join membership.
There is no "you are now a member " message, no email notifications to myself or user.
this plugin is simply not working for me. Ive uninstalled and reinstalled, and reset.. and I'm getting fairly frustrated,
I found that once I introduced a trial offer, things started to go a bit strange.
in addition once trial is completed there is no notification.
I'm baffled as it was working fine, but as I tried to introduce more memberships it started to play up.please can I have some help on this.