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Why does reading items from OPC server clear the item registers to zeros?

When I use Labview 6i to read some tag's initial values from a OPC server, I linked front panel controls through datasocket operations to the opc items to read their values and then update my global variables.I can run this Vi independently to get the values right. If I put the vi into a loop as the first vi to execute, it cleared the registers to zeros.
Does anyone know why?

What I am trying to do is to read the machine setup tag's initial values from the OPC server so that I can display them on the setup screen when the program runs.
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