N/A Do PCP rifles normally leak a bit over time?

I haven't had any issues with normal pcp airguns leaking as a matter of course. Leaks can happed, do happen, and can be caused from o-rings setting from pressure over time or a leaky valve etc. There is one brand out there designed to leak ( maybe just not designed to hold pressure for long) but they put a shut off valve on the bottle to help negate that.
 
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If I fill my HFT-500 past 2500 like to 3000 psi. It will leak down to 2500 over night and then hold that pressure for weeks. I think it is just the regulator O ring and the surface inside the air tube could be better. Reg is set to 1200 so it’s not a problem.
This may have more to do with you filling too fast, this will create more heat and expansion - so when your air vessel cools off it will have less psi.