Music keeps looping the same track

Elystan

Windows XP Pro
Service Pack 3
Currently running 1.8.6
add ons: Doom Hi res texture pack, jdoom resource pack, jdui all 20080614.pk3
Deactivated jdep

Doom 2

Play first level - no music
Play 2nd level - music track
all subsequent levels keep looping the 2nd level's music track over and over and over

Any ideas ?

Thanks