Data Caching problem in App Router help plz

When I log in with a user who has specific data, that SAME data appears even after logging out and logging in with a different user. Why is this happening?

Flow:
1. I'm entering
/login
and logging in with user A
- Opening clients page
/clients
, viewing data
- Logging out
- Entering
/login
again, this time logging in with user B
- Opening clients page
/clients

- SEEING THE SAME DATA that appeared to user A

Reloading the page works, but this solution is very primitive and unacceptable to my very high standards of someone that builds stuff for 10 years and made barely $20.

I'm using the T3 stack.
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