Why do some suffixes follow the URL, do you know?

[Coleman]

This is a website of my friend about online sales of optical modules. Every time I visit, there will always be a different suffix following the URL. This is not standard from the perspective of SEO. How to deal with such problems?
The URL of the checkout page in US dollars has US：https://www.fibermall.com/store-16528-100g-qsfp28.htm?iso=us
If you choose to use the GBP checkout page, the URL will have gb：https://www.fibermall.com/store-16528-100g-qsfp28.htm?iso=gb
This is not standardized in Google's view. How can we standardize URLs?

[simon1854]

Hi, how are you visiting the site to get different URL's and why do you think that would affect the SEO? Google is super smart, there are ways of adding hreflang and canonical links to help within the header but that will depend on how its coded.

[Bitclu]

SEO is possible on every language even on Angular.