Sounds like it could be a temp thing. If I leave my bike on the drive for half an hour or an hour at mid day whilst washing it then set the pressures afterwards, I can guarantee when I go out the next morning and check them in the garage it would have lost 3psi!
If I set the tyres in the garage on the morning before getting it out then riding home from work at 4pm on a hot day things get very scary as its 3psi over.
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