Many DACs do not have the capability to input the high frequency DSD signal (like 2.8 MHz or 5.6 MHz) and the Apple OS cannot output that high frequency. Therefore, a standard was developed that takes the 0s and 1s from DSD and embeds them into a 24 bit PCM format, with a marker in the PCM that identifies it as having DSD embedded. The source outputs that 24 bit PCM signal and the DAC recognizes the marker and extracts the 0s and 1s as DSD. That means the exact DSD bits are available to the DAC to play.
There are 16 bits of DSD embedded in each 24 bit PCM sample. The other 8 bits are the marker. So, a 2.8 MHz (1x) DSD signal gets embedded in a 2.8Mhz/16 - 176KHz PCM stream and a 5.6 Mhz(2x) DSD is embedded into a 356 KHz stream. Your pictures show a 5.6 MHz stream being output as DoP and the DAC shows a 356KHz input stream, which is just the DoP PCM stream.
All is working as designed.
