RTH looks different

On stockcharts it looks like an interesting resistance becoming support situation on the weekly..

http://stockcharts.com/h-sc/ui?s=RTH&p=W&yr=3&mn=0&dy=0&id=p98088252586

But the attached chart generated on optionsxpress shows a different picture all together.. the line of drawn on the black chart from optionsxpress is where support "should" be? as per the stockcharts chart.. but isn't..
apologies if this is a basic/stupid question..

Cheers
 

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