So I see that you are using multiple instruments prices and the SMA to calculate your plot value on your indicator.
Calculating your plot values this way should not effect how your Plot is being calculated since it is not using a previous value of the plot.
Testing this out on my end both values are .366 like on your chart. That being the case it maybe the other instruments values that maybe causing the differences.
If you reload your Strategy Analyzer do the values match? If not, you may want to use the Print() method to make sure that both instruments are going to have the same values. Here is a thread that you may view that has an example of this.
Let us know what the results are.
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