AD9959 Setup

Hi, I am looking to understand fully the AD9959 evaluation board in order to implement my own driver. I was wondering if it was normal that each channel do not input the same amplitude value and if so why ? I expected to have the same amplitude for each output considering the fact that the output circuitry are the same for each channel (page 25 of the user manual).  I am currently restarting to the beginning by reading the full documentations in order to demystify this mystery . And also for each channel we do have 2 types of inputs, the filter and without filter output. I realized that I get nothing with the DAC OUT output without filter because there is no 0 ohms resistor for each DAC output ( resistor 24,23,26 and 28 in the page 25 of the user manual) Is there a reason for that ?

Thank you for your time and wish you the best.