it doesnt work on multiple devices

so i bought the stats.fm plus bcs i thought it would be fun to have my music tracked, but it says that i listened to my favourite song 2 times in the past 4 weeks which is not true so i think it just doesnt track my minutes on my pc but only on my phone, i dont listen that much on my phone, they have the same accounts. This is not okay, i spent 3 dolars on this and got wrong data