Hey Joseph!
Thanks for letting me be your planning sidekick! I know that park reservations can be stressful, but I'll do my best to guide you through it.
Guests need to have a
valid theme park ticket and a
theme park reservation for each day of their visit. It sounds like you're using One Park Per Day tickets, which allow guests to enter either Disneyland Park or Disney California Adventure Park for the day. I'm so sorry that your days got mixed up and now you don't see your preferred park on the right day! That leaves you with a couple of options.
My first recommendation is to keep watching for a chance to
modify your theme park reservations, because people may change plans and theme park reservations can open up.
Next, you could consider upgrading to
Park Hopper tickets. You will still need to start your day in the park that matches your reservations, but you could then visit the second park after park hopping opens (currently that's at 11:00 AM). To upgrade your tickets you would want to call the
"Tickets" phone number for a Cast Member to help.
Taking a look at the
Theme Park Reservation Availability Calendar I see that Park Hopper tickets do have reservations open to start at Disney California Adventure Park over the next week or so. I also see reservations open on some dates for Disney California Adventure Park for One Park Per Day tickets, so if your plans are flexible maybe you can swap which park you will visit each day?
I'm so sorry that this snag is putting a damper on your plans, Joseph! I hope you're able to adjust your plans so that you can still enjoy your visit.
Keep moving forward!
Amanda