Help in system testing.

Hi i am testing a system where the Short exit is a simple formula that

close < Ref(Close,-1)

However metastock is not taking this simple formula properly.
Following is the chart.

Kindly note the system enters/exits on the next day of getting the signal.

As you can see that the problem is in 5th signal, it shouldn't have exited, 6th signal is the right one, where it exited according to the rule. I have looked everywhere but i couldn't find a similar error.

Could someone help me out in telling what could be the problem?

Thanks is advance.

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