Cart problem

I need your help.

I installed hikashop starter and my Joomla version is 2.5.6

During my experiments to a test website everything worked smoothly.
But when i installed to my project site a problem was appeared..

When i am clicking "Add to cart" my product is adding to the cart and immediately disapears.
Then when i am clinking to go to my home page the product appear again to the cart.

My website is brownway.gr/index.php/order-form2/category/13-

Any ideas?
Thank you

Maybe it's a cache configuration?
But i am not sure. I have disabled cache plugin and from the configuration of joomla the cache is deactivated.
Any ideas?

It indeed sounds like a caching issue.
You should check your template's options. There are sometimes caching options there too.