Tool/software:
Am I setting or using this incorrectly? Why does it doe this appearent frame wrap thing?
This plot is from the Matlab cascade processing app -- the peak is split top/bottom and you can see the dark band (start of next frame)

For this plot below from the mmwave GUI PostProc, the config was from your Cascade_Configuration_MIMO.lua, and I used Cascade_Capture.lua for the capture script. I seems to exhibit the same issue (you can see at end of the 1D FFT as well):