Can downloaded MP3 songs cause problems on Iphone?

I got my Iphone 6 today, and I already put a bunch of songs I had downloaded off the internet and put on it manually throught Itunes. My songs are all out of place, the albums repeat sometimes, tracks are out of order, even though I've made sure to put the song information as best as possible for no confusion, but it still does. It even thinks the song Wonderwall is in the album "Definitely Maybe" in my Iphone, at the same time that I can see I have set it to the "What's the Story Morning Glory" album.

Is that happening maybe because those songs were off the internet and not bought from Itunes so they have like different codes that mess up the Iphone music library?

It's not like that, still you have any problem regarding this, then it is better to use some of the reputable sites which gives high quality MP3 songs. Here are the list of some of the reputable sites https://www.iomoio.com/index.php?pid=3140 which are really good.

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