This has been a common error way back to the s-1 sales. After a few hours they should have it fixed.
I have had them fix it for me on s-1's s-3's s-5's and hopefully in a little bit on s-7's.
I want more and now must wait for the first one to clear.
Same thing happened to me. But rather than just wait for it to clear, I started a support incident.
You'd think that after all this time they'd get their payment system right.
It is annoying as I want 1 more and I am waiting for the first one to show up as paid before I order the second one.
I never place orders over 2500 from china as I had a few tie up in customs for weeks.
So I figured I will place them 2 or 3 hours apart. SInce they have had this cancel your order error happen for close to 2 years to hundreds of buyers I knew to wait before the second order.
So if this sells out before they tell me the first one clears I won't be able to order a second one. Pretty annoying.