@Narsil Hey  I found an interesting thing and I created a small app to show the problem. Depending on the content sent to the tts model, the voice is being returned differently.

  

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You can just try to paste this 2 slightly different paragraphs and you will see the difference in the voice.
“Water heated to room temperature feels colder than the air around it. This is because the temperature difference between the water and the air is greater than that of the air surrounding it.”
“Water heated to room temperature feels colder than the air around it. This is because the temperature difference between water and air is greater than the difference between the temperature of the water and the air.”