If i press on cart tab, shows me the item twice

[ther3y3s]

I'm getting some problems with cart. For example, if i add an item to cart and press on button, on dropdown menu, i see the item twice, but i add just one, in fact if i go on cart page, i get only 1 item
https://prnt.sc/t9cxot

Sometimes, when i add someting on cart, if i press on cart tab, i can't see what i added. I must refresh page to see the new cart.
https://prnt.sc/t9cytp

does anyone have a solution?