It's fairly straight forward to explain why. If you 'fit text to a curve', in your case a circle, say 200px x 200px, if the text fits outside the circle (or is lower case with characters protruding below the base line) the text plus the circle is no longer of equal dimensions & the centre of rotation is no longer in the centre of the circle.
Here's how to avoid this:
EDIT: Just saw you've found a solution, which works equally as well
Wow Egg terrific explanation, I didn't realize to look the rotation signal, you're right that's the problem.
Thank you very much for your time, You know fit text isn't something you use everyday I hope to remember the tips next time, this matter got me ungry many times.
Best regards and again thank you so much
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