…I’m suspecting there could be a problem with the magnet, not being polarized as expected…
EDIT:
AARGH! yes, sorry… I confirm that they sent me the wrong magnets, axially polarized.
so, pay attention and DON’T buy from this link: Aliexpress -DON’T-BUY- link
I’m sorry to having wasted your time for such a silly thing… I’ve mounted the magnets vertically and it works as expected…so sorry…