Some songs takes couple secs to play offline

Hello,

So i have around 25 song offline in my library and on some of them whenever i try to click them they would take a couple of secs to kinda load and play. Its also weird that when i'm using wi fi it takes around 2 secs and when im on cellular data it take a lot more, around 10 secs, and then when im completely offline it plays instantly. This only happens to two songs. Im annoyed right now. Is this heppening to other ppl too?

Thanks.