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Anna, I think everyone has given you good explanations here for what you are seeing, except for one other factor.
As you didn't name the event, I can only mention that if it was a historic or classic event you have to bear in mind that those guys are racing on kit which, largely speaking was lifed out long ago. The longer parts are in circulation the greater the chances of damage to and distortion of sealing faces and so the graeter the chances of leaks and unreliability.
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