Hi. You are not quite right about how you perform the conversion. I'm facing the same problem.
The rule says that "A letter with adjacent letters j and t is not converted." Accordingly, the transformed sequence looks like this: jptddwd

0 + 3 + 0 + -2 + -2 + 4 + -2 => 1, therefore answer is "Left side wins!"

Hi! I noticed that in your answer you also converted the letter z to s, although I see no reason for this. I think the mistake is in this.

The original sequence: jdtqzbq
Correct sequence after conversion: jdtpzbq
And the sum of the letters: 0 + -2 + 0 + 3 + -1 + 2 + -3 => -1, therefore Right side wins

I hope I helped you figure it out.

That's because you're mutating the original array in your solution.

I made a solution in TypeScript and did not pass the test, copied the same solutions for JavaScript and all the tests were passed