Welcome to planDisney, Shannon!
So sorry to hear that you are having trouble
purchasing tickets to the Disneyland Resort. I'm not quite sure what the problem could be, but if you are experiencing issues on the Disneyland Resort website, you might want to try purchasing your tickets on the
Disneyland app. You can do this by tapping the plus icon at the bottom of the app and then tapping "Buy Tickets." You'll then be walked through the process of selecting how many days you want to visit the parks, how many adult and child tickets you'll need, and then you'll be able to make your park reservations. If this method also doesn't work, I suggest calling Ticket Services at (714) 781-4636.
Since it sounds like you already have your ticket and reservation in place, you'll just want to ensure that the other tickets you purchase have the same park reservations that you have and you and your family will be all set. If you purchase Park Hopper tickets, you will make a theme park reservation for the park you want to start at and then at 1:00 p.m., you can hop to the other park.
Finally, if you haven't done so already, you might consider
making dining reservations for your group. If you plan to eat at any of the table service restaurants, reservations are highly recommended. Reservations can be made online or on the Disneyland app up to 60 days in advance.
I hope you and your family have a great time at the Happiest Place on Earth!
-Linda