I assume that you're using Paid Memberships pro for recurring subscriptions for memberships. This issue is entirely connected to PMPRo and how it handles membership options. Since we have never seen this issue, we're not sure what could be causing this.
You can either try contacting
PMPro for support or share your site link with us and we can check to see if there is any conflict with the theme here. We will need a site link and WP admin credentials to check this issue on your site.