Why i cannot acept offer

[dkingz11]

I am trying to accept offer from seller and imsays review offer and then accept offer, which I did but then a box comes up and i cannot accept offer

[eburtonlab]

What is inside the box?

Any difference if you try another browser? Be sure you are signed in to the same eBay account that received the offer if you have more than one eBay account.