I'm so sorry for the ordering troubles. There may be a few things that may be happening to prevent the order from going through. The first thing we typically suggest is to sign out of your online account, clear the cache and cookies on your browser. Also close down any other instances of oreilly.com you may have open. Then, log back in add the items to the cart and try the order again. This should clear the session ID you have on our site and allow the order to proceed as normal.
If that doesn't work, please either give us a call or drop us a line to firstname.lastname@example.org so we can assist you further. I hope that helps!
You can contact us at:
1-707-827-7019 (outside the USA)
7:30 am to 5:00 PST
Customer Service Rep,