I try to create and checkout a new local branch via magit. Pressing 

M-x magit-status then
b c for branch create 

and in the magit buffer I see the new name of the branch that I am apparently on. However my file buffer still shows the former branch name. only if I reload the buffer content via C-x C-f the new branch is shown in the modeline. Is this intentional or how can I change that?