I just set up a CO2 system using a Dupla regulator. The pressure reading is
bar pressure, not PSI and when I first hooked it up it was at 40 bar. It
has been climbing slowly since I hooked it up yesterday and is now a little
less than 50. The gauge says the optimal pressure should be between 60 and
80.

What, if anything, should I do? Should I be worried?