Hi,
There are some checks in the function which display the popup
github.com/HikaShop/hikashopshipping-bpo...bpost/bpost.php#L275
The first one is to only display the popup when "bpost" is selected.
Second one is to not display two popups in the same page.
The third is not check the cache to not re-display the popup if nothing changed.
Unfortunately, the function which update the cache and the function which display the popup can be called in the same "page" and they do not use the same container for the cache.
For the line 224
github.com/HikaShop/hikashopshipping-bpo...bpost/bpost.php#L224
Please replace
$cartClass->save($cartObj);
By
$cartClass->save($cartObj);
$cart->cart_params->bpost = $cartObj->cart_params->bpost;
I guess that it should fix your issue.
Let's us know if you have any further problem with the plugin so we can validate the patch and submit it in the github repository.
Regards,
Regards,