I just found out where the issue lies. When I enable the option “Enable Store Sidebar From Theme” , everything works fine, the contact form as well as the left alignment works as it should. When i disable it, the problem came back and this doesn't happen in previous version so I believe it's a bug to be fixed.
Tried that many times and used different devices, same result ! the message “your email is sent” doesn't even appear after sending message. Why don't you give it a try yourself and see if you get the same problem.