Thanks Amber. As mentioned earlier, I'm normally an email hoarder. That was the first time since I got this computer that the email has been cleaned out (it's 6 years old!). A lot get deleted straight away, like items that didn't sell and relisted and other useless eBay emails, but most just go up the page.

The payment went through for all the items, so something obviously stopped the first payment. Otherwise it wouldn't have let me pay for them.

Yes. Paypal is good at flagging repeat attempts to pay if it's already gone through.

I don't see why the seller would have shipped though.

Is it possible, Paypal didn't stop it as it looked like a new order altogether?

you might get two lots. If you have paid twice. Keep an eye out for it when you get your bank statement. I know you're not too worried, but it's a bit of an odd one! 

Paypal last year had that glitch where transactions went through twice. I wonder if anyone else has had weird paid/unpaid Paypal transactions. Mine look OK.