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@hugo7
Had the same problem with mine - it should have been 27.2, but that was too tight and 27.0 was too loose.
Have you checked that the clamp hasn't been overtightened? Thats what happend to mine.
In the end I (retro de corsa) gently prized open the clamp a little to get it back to its original state.
Post a pic of the back of the seat clamp and an aerial shot.