I had the datapack working normally for a week, but suddenly it stopped playing the songs and now it only plays disc 11.
All the functions on the datapack are working, including the ones to play the songs.
I tried reinstalling the datapack twice now, including doing the setup through the program again.
I'm running in a paper server on version 1.19.4.
I have a couple plugins installed, even tho it was working with them normally.

The plugins installed are:
AppleSkinSpigot
ClickableLinks
emotecraft
GSit
Jukelooper
OpenInv
ProtocolLib
quick-harvest
SkinsRestorer
ViaVersion (ps.1: I installed this plugin on the day it stopped working, but it was working fine for the entire day. ps.2: I did removed it once the discs stopped working, but even reinstalling the datapack didn't make it work).
voicechat
YamipaPlugin

I've discovered the music discs only play normally when the jukebox is above a hopper.
I deleted the Jukelooper plugin from the game and still it was like that.