About rfsoc qpsk question?

Hello all!
I have used rfsoc_qpsk 1.4.2 from https://github.com/strath-sdr/rfsoc_qpsk for test and validation with ZCU111 boards.
I have the following questions:
1)When I observe the acquired signals from MXA Spectral Analyzer and find that there are the both other signals On either side of the carrier signal(1000Mhz)(including image carrier signal),the following chart is snapshot of Spectral Analyzer,Whether or not these signals are normal?

2)when I change DAC sample rate 1228.8Mhz to the other greater than 4GHz,As a result,system exceptions may occur.

Best Regards.

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