Caching issue. Solved issues with Wordpress but some users still affected

GT metrix tests show cached version of the site when we had a video in the home page slider but it was deleted 2 days ago. We also had some issues yesterday causing a critical error in the cart and the home page to show only blue text with a white background which eventually went away on its own but it is still showing for some users in the US and the critical cart error still happens for some users although we fixed it on our end by updating woocommerce cart and payment form templates that were conflicting with our shipping calculator. We asked the customer to clear website data and use a private browser but it was still happening for them. On our end everything is fine now aside from GT metrix not seeing the live site.

What makes you think that any of these issues is related to Cloudflare?