Why does the Buy Button disappear on my site after navigating subsites?

Topic summary

Shopify Buy Button embedded on a Cargo-built site disappears after navigating to a subsite and returning to the main page. The button reappears only after a manual page refresh.

Observed behavior: initial load works and orders are slowly rolling in, indicating the base integration functions. After a user clicks into a subsite and then goes back to the main site (where the button is placed), the purchase button is missing until the page is refreshed, blocking some customers from buying.

Context: integration is live on www.no-press.eu (Cargo website + Shopify Buy Button). No code snippets or media are included.

Requested help: how to prevent the Buy Button from disappearing during site navigation and ensure it persists without requiring a refresh.

Status: no solutions or troubleshooting steps have been provided yet; the issue remains open.

Summarized with AI on January 7. AI used: gpt-5.

Hello everyone, I connected Cargo website with Buy Button. Everything is working fine, orders are slowly rolling in. The problem appears if a user clicks on a subsite and then returns to the main site where button is located, button dissapears. The button appears again if you refresh the site.

This is obviously very annoying, because some customers cannot purchase the items because the button is dissapearing. How to solve this? Website url is www.no-press.eu

Thanks in advance!