When too many items are added to the cart, a message with this information does not appear. It goes to the notification queue and only after opening the next page all notifications are displayed. The problem occurs on cached pages. Please check out the video and sample page. Notifications are saved along with the website in the cache and the next customer who visits the website still sees the notification. The demo site has the same problem. Please check how to fix it. I use WP Rocket.
https://streamable.com/i625jk
https://swiat-zosi.pl/sklep/wieszak-haczyk-na-drzwi-ubrania-11cm-5-hakow-bialy/
https://xstore.8theme.com/elementor/demos/niche-market02/product/wooden-classical-golden-chairs/