My Disney Experience not working properly

[AngiTN]

How do you just dump Disney cache on Safari?
I made sone changes to some reservations on the app, but they still show the same as before the change, but i got the email confirmation of the changes and the website reflects the correct information, just not the app.

The app may never show changes, for whatever reason. Even using the update button on the app won't load some of the changes.
One prime example, I can change a FP. If I look on the My Plans page on the app, they'll never update, no matter what I do. If I try to click Modify from that screen, it won't work, I'll get an error
But, if I click the Fast Pass button and go in that way, it does show the change and I can use the Modify link.
Just another way the app is still worse than the website