Refreshing shopping cart

Hi Tuan,
After adding another event to the shopping cart, I always have to manually view all the events in the shopping cart.
Is there a workaround to solve this problem?

And it's somehow also limited to add only 4 events into the shopping cart. You can do a try on  ferien-spass.ch/angebote

Thanks and best regards
Bjoern

It's due to the Plugins: System - Expires Headers

Honestly, I do not have any clue why that happens. In this case, I guess you will need to disable the plugin you mentioned above

Regards,

Tuan