APM2 w/ 3DR power module displaying wrong voltage

I've just loaded new firmware on to my APM2.5 and restored my saved parameters for this setup, but the voltage reading is displaying lower than it really is. Eg mission player will display 16.2V when the true voltage is 16.6V.

I have it set in mission planner to:

Monitor 4: Voltage & Current

Sensor 4: 3DR Power Module

APM Ver 2: APM 2.5 - 3DR Power Module

Is there a way to fix this? I've tried setting the voltage divider differently in the advanced parameter list, but it looks like this setting is ignored.

If I try and add the APM input voltage, I get a pop-up from mission planner saying 'not available' It's MP 1.2.48

Cheers

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