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USB header hub causing backflow? Is this a problem?

SolidSonicTH
By SolidSonicTH
in Cases and Mods
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I bought this thing: https://www.amazon.com/gp/product/B081SN579Z/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&th=1

 

It's a cool idea (it interfaces off the header rather than the PCIe slot, it just mounts in the slot) but when I plugged it in, putting my PC to sleep or even shutting it down causes the CPU fan and optical drive to stay powered. Strangely, it seems to come off the Type-A port at the back of the card. This happened in more than one PC I tested.

 

I asked for a replacement but to me this seems like it's inherently incorrect in design. Any explanation and what the potential consequences would be?

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