I encountered malware of some sort on iOS that replaces the QR Code displayed by Mycelium with a scam code.
Details in my post at this link:
https://bitcointalksearch.org/topic/qr-code-replacement-scam-2696238
tl;dr
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As far as I can tell, they must have some sort of malware on their phone, or some hacked version of Mycelium that is replacing the QR Code with a scam code.
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Lesson learned the hard (and VERY expensive) way...
ALWAYS CAREFULLY DOUBLE CHECK THE ADDRESS WHEN YOU SCAN A QR-CODE!
Of course, if someone finds a way to replace BOTH the QR Code AND the displayed address, then there would be no way to know that the address is wrong. But until then, if the code doesn't match the written address, do not send the bitcoins!