Q: Bug in Logic Pro X 10.2.0?

I've had problems, not very often, but very annoying.
The problem is the following :
When working with automation often the master volume is set to mute, or other functions, such as monitoring are triggered in what seems a random way.

Today's problem.
I was using automation for volume as such :

Then the Master Volume (pink on right) is on mute :

Even after deleting "all automation" the volume stays mute or other random buttons are switched on on different tracks.
Am I doing something wrong or is this a bug?