I have a problem with my website.
I'm using magento 220.127.116.11 and i just discover that using internet explorer creates an issue with cart and checkout.
When i add an item to the cart, it's okay, a second item it's okay but when i go on the cart page, i don't have all the items (someone is missing by example).
When i go to checkout page and connect, if i go back to another page and checkout again, I have to reconnect !!
But the best is that when i'm using F12 developer tools without changing emulation mode, it works !!!
I'm going to be mad...
I change session management : cookie lifetime : 82400, cookie domain ... but still not working.
You can test here : the website
I have the same problem on two other magento 1.9 with internet explorer...
Someone can help me ?