If the backend still sends the wrong value, how would you further localize the problem?

If incorrect values come from the backend, I would start localizing the problem by checking several key points:

1. Server logs — check what exactly the server sends in the response. This will help understand whether the error is at the data formation level or afterwards.
2. API contract — compare the received value with the API documentation or specification to understand if it matches the expected format and type.
3. Backend tests — verify if there is coverage for this case and if they pass successfully.
4. Intermediate layers — if there are proxies, caches, or gateways, check if they distort the data.
5. Repeat requests with different parameters — to understand if the error reproduces consistently and under what conditions.

This approach helps narrow down the search area and determine exactly where the problem occurs — in the backend logic, in integration, or in infrastructure.