Carpet Issue Stain reappears?

Why does my carpet always show the same stain in the same spot after its have been cleaned?
By that I mean, after I steam clean the carpet within 3 weeks the same stain reappears in the same spot.
How comes?
Mango.
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wrote:

As the top of the carpeting dries, it draws the stain up from below the carpeting and/or padding. Actually this is a common occurrence with certain stains.
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