I see you add a note : Note 4. Do not push rotary switches down to the pcb as they may short on solder joints under them.
I cut the pins under the Switch short, but yes, I pushed them.
Do you think that's the cause !
It be too hard/long and not equipped to unsolder all the Switch pin for move it. I'm kind of stuck !

Maybe for a next batch, it be a good think to move them side of the rotary switch for avoid problem.
best
F