Cerbo GX erroneously showing 100% for tank sensor

Hi All
Just found a worrying condition on my CerboGX. Recently connected the fuel sender directly to Cerbo Ac input 1. European 0-180ohms. Beginning this morning, after motoring a few days from a full tank, Cerbo shows fuel pegged at 100%. Digging into the console resistance is shown as 125Ohms suggesting the expected ~70%. Why is my advanced screen and dashboard showing 100%? How can I correct?

I am not on latest Cerbo firmware so I am upgrading now and will report back.
It goes without saying: Showing fuel full when it is not is the wrong way to fail here.

Thanks
Thomas

[Edit: Update to latest firmware and it has self corrected for now]