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There are several reasons why there may be a discrepancy in the hash of Python packages while installing with pip:

Corrupted package: The package may have been corrupted during download or transfer. This can cause the hash to not match the expected value.
Outdated pip version: An outdated version of pip may not calculate the hash correctly. Updating pip to the latest version should solve the issue.
Security risks: If the package has been tampered with, the hash will not match the expected value. This can be an indication of a potential security risk and requires further investigation.
Different platform: The package may have been built on a platform that is different from the one on which it is being installed. This can cause the hash to not match.

To mitigate these issues, it is generally recommended to download packages from trusted sources and verify the hash before installation. Additionally, ensuring that pip is up-to-date can also help mitigate some of the above issues.