How do I split signals?

I am using the DAQ input to bring in four analog signals.  Each signal goes through some mathematical operations specific to the signal.  My problems are these:
1. when I split the signals to perform the operations, they do not correspond to a single channel.  Sometimes they switch around and one of the channels is getting lost entirely. 
2. My BNC 2110 is not collecting the same values that I see with a regular voltmeter.
I would appreciate any help I can get!!
Thanks

Thanks for getting back to me!!
I first used a dynamic data wire which didn't work, and then I indexed each of the signals and used 15 precision data type wiring.  The signals are still jumping around.  One of the values is supposed to be in teh 10^-3 range, and the other three should be between 0 and 10.  Right now the tiny signal is relatively large and the other three are minuscule and varying at a much faster rate than the physical conditions would be doing.
Any solutions?
THANKS!!!!!!

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