Thanks for choosing our product!
We understand we are customizing for you on other topic.
However can you send us the purchase code for check?
Now it show your support expired.
About this issue you need install a light box plugin like this:
This issue come from Lightbox of plugin.
If you notice when Popup open, the scrollbar at the right hidden and it cause the issue.
In this case maybe you need to change settings of Lightbox. https://prnt.sc/15ftg9e
You can try this CSS code: