FX FX Crown regulator??

Bought a Crown MK2 off classifieds and just went to fill gun and noticed that reg pressure was going up with the fill, at 225 bar reg gauge read 225 bar. I shut compressor off and fired 5 shots and reg went down with pressure gauge but stayed there. When I started fill reg gauge was on 145 bar.
Does this mean reg is junk or some how stuck?
 
I view the Crown as the successor of the Royale, with easier adjustment. I don't think they're at all hard to work on. I can strip and seal a Crown of it's critical orings in 45 minutes or so. Now the Impact....I love 'em, but they're a bit of a turd to work on. There's just so much to deal with going wrong. BUT, when they shoot, they shoot really well indeed. I'd still love to get my hands on an unmolested Mk2 with PP, and I'd be a happy camper.

FX pushes the limits, no question, and that seems to be why they outsell all others.