Can I get some help with a magnetic cable reverse charged?

A

AC Question

magnetic cable reverse charged

I just bought a magnectic cable, at the times I charged it with reverse position(negative n positive).
now my magnatic charging point seem like became out put already. When I put the cable stick to my phone without plug with charged, my magnetic cable still will turn on the light, that mean my phone there became output, and give current to the cable.
But the USB side charging is OK. And I test the cable with other phone is OK.
anyone face this problem, what can I do?
 

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