nipper

I have a patch where I am trying to find the average of 10 numbers that act as a circular buffer. Please take a look at the patch to better understand what I mean:

Now, I intend to subtract the most recent value (given by the button press) from the last value. From here I will calculate a rolling average. However, when the calculation first occurs the result is fine and the subtraction is correct. Again, on the subsequent button press the calculation remains correct. However, when the button is pressed one more time, box 2 subtracts box 1 and I do not understand why. Perhaps there is a simpler way to calculate what I need, but it all looks okay to me. If any one could help explain what the issue is then that would be fantastic!

Subtracting issues from routed information