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By default, All in One SEO Pack outputs images in the XML Sitemap to comply with search engines such as Google that want images submitted to them for indexing in Google Images. This feature was added in version 2.4 of the free plugin and version 2.5 of All in One SEO Pack Pro.
However, some search engines do not support images in an XML Sitemap. One such search engine is Yandex.
If a search engine does not allow images the XML Sitemap then you can disable this feature by using the Exclude Images checkbox under All in One SEO > XML Sitemap or you can use the filter hook here.