This is the first test:

test.assert_equals(solve("cozy"), 51)

And it is fine. Not a kata issue. Check if you've changed the sample tests clicking on Reset.

Python

In which language?

Test 1: "oczy" should not be 51.

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Expected vs returned is exactly the same [...].

That is false. Please reread the description and look at the sample tests to see the expected output.

Not a kata issue.