Cart/checkout issues

[hpop3584-2751n50]

I have double checked my cart, it is correct and all items are available. However, when I go to pay, it takes me from 13 items to 10. Thought it was a PayPal restriction, but it does the same when I pay with Apple Pay or a bank account. What’s going on?

[eburtonlab]

Not all items can necessarily be combined into a single checkout; you may have to check out more than once to purchase them all.