RZ/A3UL EVK - Unable to read correct values from ADC Channel 1

Hello, 

I am testing out the ADC Example Project for the RZ/A3UL Octal Edition Evaluation Kit, and reading values from ADC_CHANNEL_0 works fine, however, if I adjust the code to read from CH1 I get incorrect values. 

The only line of the code which I adjusted is the following, in src/adc_ep.c:

    err = R_ADC_C_Read (&g_adc_ctrl, ADC_CHANNEL_1, &g_adc_data);

I get the same strange behaviour on a custom board I've designed based on the R9A07G063U01GBG#AC0 chip.

Any ideas which might be the issue here?

Thank you in advance!