Logic Pro only playing one track during playback

Been using Logic Pro for 2.5 years now recording a comedy podcast and today for some reason on playback it’s only letting me hear one track? I have zero clue why this is happening it isn’t muted, it’s on stereo out. I can actually click the highlight box to the left and it will then switch the audio to the other track but I can’t hear both at the same time!? Please help!