It depends on if you have the cheap ones or the expensive ones.
The cheap ones tend to have magnets that are in one place but allowed to rotate to align with another magnet. This works when you’re adding one to one, or even one to a joint with another two.
But when you’re trying to add a pair to another pair, neither is strong enough to force the other pair to align, so you end up with a weak connection.
The more expensive ones tend to have more robust magnets in them, even magnet pairs rather than a signal magnet, and they can align more easily.
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