Why are my notifcations silent on vibrate mode?

[AC Question]

Whenever I turn on vibrate mode, my phone turns notifcations/system to be silent. And I can't change it. It's locked/greyed out. I went through the settings and I can't seem to locate the problem.

Whenever someone texts it's just silent so I miss messages. :/ any advice would be helpful.

Thank you.

 

[bboysmax]

Which phone are you using?