Solved

all staff in the shop are showing gone in buy now

What did you try to do?
I wanted to buy a TD and CD

What happened instead?
The game was showing that all of them are bought

Did the problem happen while using wi-fi, mobile data, or both?
Wi-fi

Did the bug happen in the app, on PC, or both?
App

What is the model of your device?
Redmi 5

What is the operating system?
Android

What is the version number of the operating system?
11.0.2.0

Can the bug be reproduced?
Yes, but it will cost me tokens

Additional comments:
This issues went off for some time so I quickly bought the staff I needed but it can happen again