Using PC_1 and PC_5 results in a faulty reading values, Why?

The question is regarding Nucleo-l476RG, I need to use 5 ADC, 12Bit.

No matter what I do. I cannot see that these pins are connected to anything else.

Why do I get a wrong reading on these GPIO?

Please notice that my board is new .. the MCU is not damaged.

I used the PB_1 for the same measurements and it works just fine. I have no idea why this happens.

I use mbed-os in my project .. I don't think it is mbed-os's fault either.

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Guru

Check solder-bridge options for PC1

If it is not hardware, then it is software. Proof the design using HAL, LL or register level code. Probe the pin-to-pin with a meter.

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HW was OK.

And why should the mbed not work just for these two pins? I don't get that.

The value reads from these pins seems to be multiplied by factor > 1.5

The same software I used with PB_1 and it works just fine.

Don't know what could cause that.

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