payment problem-help!


Hey, can anyone help? I just got this from a customer: „I just wanted to add many items to a shopping cart.  As soon as the first item is in the basket, I can not add any more, but will be taken directly to the payment page (applepay or Paypal) without adding a second product to the shopping cart.  I have made several attempts.  Unfortunately, the problem remains.  It would be nice if it could be fixed.“
Anyone knows how to fix this problem???