GPIO pin numbering wiringpi

[9V1LH]

I want to use unipager with an NW Digital Radio UDRC (v1) board attached to a Raspberry Pi 2B. The physical pin is 32 which equals to wiring PI GPIO26. To manually toogle the gpio pin via "gpio write 26 0" or "gpio write 26 1" in the console works fine, confirming the number is correct.
However, when I check with "gpio readall" I found strange behaviour in Unipager using the GPIO pins. Examples:

• GPIO0 -> unipager toogles wPi 0 (BCM 17, Pin 11) -> OK
• GPIO12 -> unipager toogles wPi 12 (BCM 10, Pin 19) -> OK
• GPIO20 -> unipager toogles wPi 28 (BCM 20, Pin 38) -> NOK, uses BCM notation
• GPIO26 -> unipager toogles wPi 25 (BCM 26, Pin 37) -> NOK, uses BCM notation

Issue: The GPIO26 (BCM 12, Pin 32) can't be used with Unipager