Your pressure looks correct to me. With a full bottle you should be just less than 1000 psi. It is actually reading just the vapor pressure. The bottle is filled by liquid weight not the vapor pressure.
Set the bottle in the sunlight or warm it up like in summer months and the gas expands and gives you a higher reading. Its still just as full, only more vapor pressure. On my kegerator, I place the bottle inside where it is cold and the needle really drops, set it outside and it climbs.