Problem with simple moving average plotting incorrectly for TS2000i

[LScharpen@xxxxxxx]

I've been using TS products for a number of years and TS2000i for the last  
5.  A few days ago I noticed some 'strange' behavior in the charting of a  
Simple Moving Average.  It was significant enough that I thought I'd check  to see 
if anybody else may have seen this or might see it in the future.   Let me 
explain.

Let me first give the specifics of the chart.   I don't think these 
'specifics' matter much but they at least provide a concrete  starting point.  My chart 
was a 1 min. bar of ES Z5.  On this I  had  Bollinger Bands (20, 2 stdev) and 
a 20 period SMA.   I then  happened to notice that it appeared that the 20 
period SMA was NOT in the middle  of the upper and lower Bollinger Bands.  This  
was confirmed in  several ways.  The 'visual' method was done by putting 
ANOTHER 20 sma  indicator on the chart and observing that the two different 20 sma 
 did NOT  overlay each other.  However, if I then turned the sma status OFF 
and then  back ON, the discrepancy 'went away'.  Over the course of time, the  
discrepancy would then slowly drifrt back into the chart.   

It's a real pain in the ass to not be able to trust something  simple like a 
moving average.  I've given enough detail so that it would be  relatively 
simple for somebody else to try to reproduce what I've seen.   I'd sure appreciate 
hearing form anybody who tries the experiment and, more  important, from 
anybody who  has seen this problem and understands how to  'make it go away'!

Thanks.

Lee Scharpen