Music isn’t showing up

i love using google play music, but when i add songs to my library on my phone or laptop, they wont show up on the other device and i have to search the songs again and add them again, sometimes three or four times. when creating a playlist, songs were added in duplicates and when i tried to delete the duplicates, it deleted all of the songs or random songs i hadn’t selected.

dnnteoannc about Google Play Music, v3.35.1010