Gas Density Question

[-Sven-]

Shearwater Cloud (I’m running ver. 2.7.1) allows to display gas density. For a dive in OC mode gas density display is as expected, gas density increases with increasing depth and decreases when diving shallower. In CC mode gas density does not increase with depth. For example with air diluent and set point 1.3 Shearwater Cloud displays a gas density of 1.8 g/l at 40 meters and at 15 m and at 6 m. Although the fractions of O2 and N2 in the loop change with depth I don‘t understand the displayed values. Am I missing something?

Thanks - Sven