Opt-in form in wordpress - buggy or? After activating a form it creates an empty block on the bottom left corner across all pages, won't go away after the form is removed , goes away only when the add on is disactivated or deleted, and comes Back

opt-in form in wordpress - buggy or? After activating a form it creates an empty block on the bottom left corner across all pages, won’t go away after the form is removed , goes away only when the add on is disactivated or deleted, and comes Back after the reactivation