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The first email in that screenshot has a date of "12/6/22".

Perhaps a date parsing error?

No. Probably the date was set wrong by the sender.

YY/MM/DD (June 22, 2012) ?

That's the chinese date format (GB/T 7408-2005), so the GMX web mail client probably doesn't convert it into a uniform format.

So, a date parsing error?