Invoice Question

[scaught]

I'm just way too excited for my upcoming cruise so I've been booking restaurants, and double checking things. I've got my bag tags printed out already, worked on packing list a little bit.

Anyway. I was looking at my invoice and trying to reconcile what each row means. See image attached. I think I've got everything sorted other than the guest 2 (169.00) line. It's another 75% discount for the second passenger, but for what line item? I tried googling some of these codes and searching on the site but couldn't find anything. 

Thanks for any assistance you all can provide.