Cookie Safari iOs
===

I'm developing a web site. The first time you go on it, it display an overlay with some informations. After when you navigate from page-to-page, thanks to a cookie, the overlay is not display anymore. 

That's working on every desktop browser... but when I'm using safari on my iphone, the overlay is display,and the cookie is create. If I refresh the page my overlay is not display (which means that my cookie is there). 

But if I'm going to an other page, then the overlay is display.. looks like the cookie is not available between the different pages.. 

Does someone know why? 

Thanks