How long does it take for the cache of a page to update?
I made a change for the text on a Page (text content in the Pages editor in the dashboard, not even a product page) and it does not show on the public-facing page, even after 10 minutes. I've experienced this multiple times in the past but normally just leave the store and it updates sometime over the next day or so before I check again. That makes it really difficult to make changes in real time if working on formatting/design.
Updating text or anything in shopify doesn't take any time. But that is very weird in your case.