If the plugin works perfectly fine with the storefront theme, then it’s not the plugin issue to solve. Applying the Xstore theme causes this problem! so I think it’s the theme developer support manner.
So if your support just trying to collect extra fees for such a small issue then I am happy to tell you that I am sorry for buying a theme form 8theme, next time just better to stay with AVADA.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.