Metro pcs t399n strange imei

Any idea : Last month i unlock 2 peices t399n metro all went well and they work perfect, today they both returned with no network but what i didnt notice

was that both phones have 3 diferent imei, when i dial *#06# the imei i get is different from the one on the sticker also when go to setting/about phone/status there is also a different imei realy puzzled,

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