I’m confused and frustrated

some mp3s will not load into mm

I purchased a number of tracks from beatport and downloaded onto my computer, I then set mm to monitor file and add tracks to the library, it will load most of the tracks but not all, I get a msg saying that some files may not be of the correct format for mm but they are all mp3s from the same source, I try to load individually but get the same msg. Anyone have any ideas !!!!!
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