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AD5660 with Internal ref 1.25V 5ppm : Refout=2.5V 400ppm ?

Good day!

I'm examine two parties of AD5660ARJ-1 (about 20 units same kind) with SOT-23 packaging

label D30 (AD5660ARJ-1) and D5G (AD5660ARJZ-1)  - both must have 1.25V internal reference,

but at pin 2 they demonstrate 2.5V. At output pin, with writed code

0x3fff, some about 1.25V with temperature depend about 1mV per gradus

C (400ppm vs declared 5ppm).

Please see applied picture for aplication shem.

What would your recommend?