why the master stopped?

[Studio Brasil Producer 3]

today i was mixing my music and i came across a problem with the master control. while the music is going on, i try to lower the master volume, but the sound gets loud just the same. that is, the master is not working, I move the master control up and down and the sound does not go down or increase. how to solve this? is it bug?

[treesha 91]

Can you check the projects tracks outputs and see if they are sent to the master bus or somewhere else?

[Studio Brasil Producer 3]

they are all directed to master

[treesha 91]

Does the master meter change when you move the master fader up and down? 

[John Vere 598]

Mute the master. If you still hear sound then your routing is wrong. You might have a hidden master bus. Check the Track Manager