After several days of testing, we finally found the issue on the BSC-ISI in the staging building. Turns out 2 out of 3 pigtail cables haven't been engraved properly. As a result, the all GS13s cabling path was messed up.

After testing all the cables one by one and plugged everything properly, it became pretty obvious that we have 2 bad GS13s on this unit (H3 and V1).

Next step:

- we need to find a way to change the engraving of the cables

- we'll change those 2 GS13s in the next days

- we need to check the engraving of the L4Cs cables.