The generic icon of mime-type type="application/ogg" should be an audio icon. Ogg is a container format that can carry audio and video data, but in 99.9 % it is used for audio. At the moment matroska is the container format of choice for video things and even xiph.org itself released an announcement that only vorbis files should have an .ogg extension (breaking their own original specification). All other ogg audio files should have an .oga extension, all ogg video files an .ogv extension. This said, it loks very strange to have all these video icons in the music collection.
That's an implementation detail. There's quite a few mime-types that have "*.ogg" as the pattern, some are audio/*, some are video/*. File a bug against your file manager's implementation, shared-mime-info doesn't specify any icons for the filetypes associated with "*.ogg". So it's a front-end problem.
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