Why same company stock charts(price curves) looks different?

Does anyone know why stock charts looks different depending on the broker you use? I mean; same company two totally different charts(price curves). I added two charts here, hopefully they're visible. Both pictures are weekly charts and company is TCF FINANCIAL CORP. They look totally different in cmc markets compared to chart on finance.yahoo.com

You sure they are the same company? The prices are different too

here is a better picture where you can see the name of the company