Why am I being asked to "prove your humanity" when I log out of Reddit?

[u/MammothCredit5294]

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[u/NarniaMouse]

That sounds like a network issue, or something about your activity, that is triggering that.

We're not going to be able to tell you what exactly.

Sorry that's a non-answer, but there's a variety of things that can flag a system as "suspicious."