Cart instance add problem

[akinsayo]

Hello.

Cart::instance('sample')->add($items);
Works as expected when called the first time.
If an attempt is made to add additional items to the cart instance,
only the latest item is added, previous items are erased.

Cart::add($items) which represents the 'default ' cart instance works
as expected and does not erase previous cart items.

Not sure if I am doing something wrong.

Additionally, is there a way to get all cart items or count all count
items without setting a specific instance. i.e. count/get everything in
the cart (all instances).