While it would take more testing to speak with certainty, it is likely the geometry of the bar. The magnets are stuck to a curved bar, but they are not themselves curved. This means that they settle best on the bar where it is also flat – on the ‘top’ or ‘bottom’ of the bar where it does not curve towards or away from the magnets.
When the filter is tilted, the magnets are forced to move to a side of the bar that curves towards or away from them, ‘lifting’ them farther from the bar. The magnetic force pulling them back towards the bar causes them to settle back on the ‘flat’ side.
What happens if you flip the filter entirely backwards?
the simple answer is “its attracted to the bottom of the rail”
How exactly that physically works requires knowing a lot more about the design than we have, but if I were designing one, I would put a steel band in the bottom of an aluminum (or stainless steel) band. magnets are attracted to the steel band, but not aluminum or stainless. So the magnet feels a pull towards the steel band, and will want to minimize its distance to it. but since there is a curved bit of metal in the way, it has to rotate around it, thus orienting correctly.
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