It seems the site is experiencing issues where the cart is empty, even after adding products. Correct?
Checking the site, I see what you mean as the Cart page is empty, even after successfully adding a product to the cart:
Has this been an ongoing issue, or one that recently surfaced? If the latter, do you recall any site/servers changes or updates before this issue first popped up?
As a first step, can you reach out to your host and ask them to make sure that your Cart and Checkout pages are excluded from being cached as this is a common reason for this type of behavior.
Additionally, I’d like to take a closer look at your sites current environment, please can you share a copy of your sites System Status Report which you can find via WooCommerce → Status.
Select Get system report and then Download for Support. This will download a TXT file that has the contents of the SSR which you can then share with us here.
Hey, I will chime in here that I have similar issue on one of our sites after latest woocommerce update. I see that on Marine’s site the item is added to minicart but the actual cart is empty. On our site adding products to actual cart sometimes randomly wont work OR removing the items. The caching is not the issue (I also tested Marine’s site with dev tools disable cache). Also debug log does not write errors related to this.
There is now something funky going on with product page/cart functionality. On our store the “add to cart” jumps straight to cart page but the item is not there. And do note that this does not affect all our products, just random products. Also when in cart you try to remove product the loader icon “goes around” and nothing happens.