No more sound in a multitrack files

Hi guys!
I'm working on a podcast and everything was fine. And suddenly, no sounds.
When I press on "play", everything looks like it's playing but there's no sound. Each track has sound when I double click on it and it's note in mute or anything.
Does that happens to someone? I tried to export my files, and still no sounds.

Maybe I did something wrong, but I have noooo idea what