Trilobot pi4 raspbian not booting

Hi,

I recently purchased the trilobot but I’m having problems getting the pi4 to boot but only when its connected to the trilobot 40pin header. It boots fine however, when I disconnect the pi from the trilobot header… I am using the latest version of pi os bookworm. I also tried latest pi os bullseye but had the same issue. I have tried 2 different pi4 model B and both gave the same issue. I have enabled i2c but that makes no difference. I then tried an old pi os buster image I had and that booted fine.
Has anyone here experienced similar issues or have any ideas what the cause could me?

Many thanks,

Gary