1- There must be a third-party plugin conflicting issue because I have tested the same thing with the London country see image: https://i.is.cc/2dxWXGlK.png and it is working fine for me: https://i.is.cc/2dypldxl.png
Now, I can see that you have a child theme activated on the site and also, third-party plugins as well. Please first disable all the third-party plugins and check back to your issue after clearing the browser cache. I hope your issue will be resolved then activate the plugins one by one so that you will be able to know which plugins conflict and causes the issue.
2- On your site, I also, check the popup, and progress bar feature of the sales booster and found no issue it is working just fine check the resulting images of your site: https://i.is.cc/2dyba1Uz.png and https://i.is.cc/2dyduiss.png you can check the live results as well on your site on the mini cart and at the cart page. You will see the progress bar is working fine.
Regards 8Themes Team.
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