SPI noisy signal when connected to level shifter

Continuing the discussion from SPI Level Shifter from 3,3V to 5V:

So , the level shifter did work, but with Raspberry, I tested all of the hardware separately and Ii found out that , the moment I connect a level shifter to the Jetson I becomme a really noisy signal around 1,6V. I can’t explain it to myself.


Another problem i saw is when the jetson is not connected to the level shifter. I wanted to test the SPI. I noticed that when slave select is down, the data is sent really fast for really small amount of time and in the rest of it , nothing is done as in the image.

Blue signal is SCK
Yellow is Slave Select
A reference from the Raspberry with the same Code and Wiring