That is a very confusing diagram, but it's correct. Take a look at #7. It includes 8,9,10, and 11. Now, look at #9. It branches into two legs, indicating that both bearings are the same PN however if you ordered just #9 I'm sure you would get one, whereas if you ordered #7 you would get two.
Sorry about the misfortune, hopefully the next show shows up quicker.