By “Stripe registration form,” I simply meant the form that connects to Stripe and is produced by using an s2Member shortcode. The person who set it up for you hasn’t got it quite right, because it is saying:
2995 Months free / then $ USD / One Time (for 1 month access, non-recurring)
That obviously needs amending. It is possible that it is the cause of your remaining problem, so you should redo the shortcode to get it right.
You also still have several javascript errors on that page. You need to eliminate them too. As reported in the browser, they are:
The resource at “https://connect.facebook.net/en_US/sdk.js” was blocked because tracking protection is enabled.
Loading failed for the <script> with source “https://connect.facebook.net/en_US/sdk.js”.
Loading failed for the <script> with source “https://trackcmp.net/visit?actid=649235425&e=&r=https%3A%2F%2Fforums.wpsharks.com%2Ft%2Fs2member-stripe-functionality%2F4537%2F8&u=https%3A%2F%2Fenglishconfidenceunlocked.com%2F30-days%2F”.
Loading failed for the <script> with source “https://englishconfidenceunlocked.com/wp-content/plugins/activecampaign-subscription-forms/site_tracking.js?ver=4.9.6”.
Loading failed for the <script> with source “https://connect.facebook.net/en_US/fbevents.js”.
It looks to me that you are trying to track the activity (even elsewhere) of all those who go on your site, and then are paying the penalty when a browser refuses to allow it.