I have "Buyers can send one combined payment for all items purchased from me within 7 days." in my "My eBay: Combined Payments and Shipping Discounts", but I don't think I had it checked. Not sure if this is causing the issue?

I noticed some of your listings sell in US$ while others sell in Cdn$.  Is that the problem?

It is NOT possible to combine listings sold in different currencies or different sites on the same eBay invoice.

It doesn't allow me to change currency when I go to revise item?

Since the majority are in US$, I will change the rules back to US$ and like you said wait for them to end.

I am waiting on customer support (34 minute wait time) to see if they can combine the current purchases on to one invoice.

Thanks for the help

canuck - I often have buyers who buy from both sites, so I have to send 2 invoices. It's never been a problem, a quick explaination on the first invoice, a second invoice sent right away and all should be good. I put all the postage on one invoice. I've never had any buyer get confused.

I will do that, thanks.