Membership and Events+ not working properly

In addition to the questions I currently have posted here

I also have a couple more, which I will start plugging in to new threads as PC requested I do.

I’ve set up my Membership access levels and Events+. I schedule an event and I indicate that there is a $15 Fee to join the event. I then set it to be free for a certain membership level, but when that level of members hits the “I’m Attending” button to rsvp to an event, it still asks that member to pay for the event.