Information box disappear very quick

Hi,

The Information box (number two in attached file) that shows up the system after click on "add to cart" button (number one) in an specific article (regardless of whichever) disappear very quick before you have the chance to click on "continue" (number three) or "go to cart" (number four).

This box shos the message "article added to your cart" or something like that.

Please, give me instructions to fix this issue.

Regards.

Sorry: this is the file.

Please, give me some support.

Regards.