Song cover changes by itself

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hapaa Messages postés 2 Date d'inscription mardi 7 septembre 2010 Statut Membre Dernière intervention 5 février 2014 - 5 févr. 2014 à 23:10
I usually set up covers to music i download.
But after, I find some songs take the cover of other songs, so some songs change their covers by themselves and turn it to one of the frequent covers.

Please, I want to know why and how to avoid it another time.
Searched on Google, but nothing I think.