Two of the same record...?

This is the screen when decorating records in My Sekai ☝️ (pics 1-3). Basically, one record per song, but looking at my inventory, only 'シャルル', '命ばっかり', and '雨とペトラ' are listed twice... 🤔 If it were alternate vocals... there would be way more, and decorating them (pic 4) doesn't show any particular difference.... Why could this be 🤣 I've never understood the reason for a while now... I'd like to ask if anyone knows.