Fluctuation in reading millivolt using AI 600 and cFP 2000

I have an application based in data acquisition.cFP 2000 and AIO 600 are the hardwares used and im giving 16.2 millivolt from a battery powered millivolt source.If i am reading the millivolt using a digital multimeter it shows constant reading of 16.2.
The AIO channel is configured for 0..6 Volt...and if i am reading the millivolt signal using FP read function it shows fluctuations as in the attached file.There is no issue of earthing problems as its in office environment and the earthing is good.Again we have changed the power supply ...still the same result.......So can any one sort out the problem.......
Attachments:
Front Panel and Block Diagrams.docx ‏112 KB

I'm sorry......
I did further investigating do to some other "characteristics" of the problem and found a second incident of one of the loops (a separate VI) sitting underneath one of my loops. I deleted it and everything runs fine now. Please forgive me my sudden loss of intelligence.

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