There's known JS conflict between AVADA theme's FusionBuilder and Membership plugin.
There's also a quick fix that you can apply to make it work:
- Visit this URL to edit main file of plugin:
YOURSITE/wp-admin/plugin-editor.php?file=woocommerce-membership/woocommerce-membership.php
or edit woocommerce-membership/woocommerce-membership.php via FTP. - Find this line:
wp_enqueue_script('rpwcm-select2-scripts', RPWCM_PLUGIN_URL . '/assets/select2/js/select2.min.js', array('jquery'), '4.0.3');
- Replace it to this:
wp_enqueue_script('rpwcm-select2-scripts', RPWCM_PLUGIN_URL . '/assets/select2/js/select2.full.min.js', array('jquery'), '4.0.3');