Crossfader doesn’t work

Since recently when I slide the crossfader of my DDJ-800 all the way to the right it cuts both tracks, but I didn’t change any settings. So it actually kinda works like a channel fader for the left deck. If I slide the crossfader further left the left track gets louder and to the right the track gets quieter. Only when it’s all the way to the right it cuts both tracks. And also when the crossfader is all the way to the left it doesn’t cut the right track.

Does anyone know how to fix this? Is it something in my Rekordbox settings or is it just broken?