Consolidation of items to the warehouse?

Hey! Bear with me here, I’m going to try my best to explain my question.

I have eight items in my Buyee cart. 8 photocards, all with the same seller (Surugaya Mercari Store).

Each one is coming up with a separate “Proceed to Order Page” button. If I click the button it’s only giving me the one photo card to order. Each photo card is about $2 USD before service fee and plan. But when I go to the order page, with the service fee and plan it inflates the price to $8.82 USD on one photo.

Is there a way I can consolidate all eight photo cards into one transaction so I’m only paying once for the service fee and plan? Or because it’s Surugaya, there’s no way for this work? I tried contacting Buyee customer service via email but had some trouble understanding what they were explaining to me. This is what they’ve stated:

“Regarding your inquiry, please be advised that multiple items in your cart may be purchased under the same order number, depending on the conditions of each item and the seller's purchasing requirements. However, please understand that we cannot guarantee that all nine items can be purchased together in a single order, as this will be determined by the individual item and seller conditions at the time of purchase.

If the items cannot be combined into one order, they may instead be processed separately, and the applicable fees will be charged accordingly.”

Can anyone clear this up for me? Appreciate the help in advance. Thank you!