Does cut pile yarn is not inserted in equal lenghts？

The scissor only cuts the second leg in a cycle. So the needle is doing the first length of the stitch, and the scissor does the second. Which one of yours is shorter, the first lower part, or the second higher part.

And this is why most people struggle with adjusting pile height on their machines, as you need to configure both needle, fabric presser and scissor on a precise level.
This video shows it https://youtu.be/plePUsFwlF0?si=3E0zxFK-qYi3V6u7

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