Currently when you look at the project buttons and project stickers at shop.wikimedia.org (specifically http://shop.wikimedia.org/products/wikimedia-project-buttons and http://shop.wikimedia.org/products/wikimedia-project-stickers-pack-of-12), the MediaWiki logo being used is not the actual MediaWiki logo. It's a poor vectorization that is not the official logo.
The project button and project stickers that Wikimedia sells should be of the actual logos, not random images found on Commons that resemble the logos.
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