Editor changes typed character (dot-> slash)

Hi,

I'm working on an mac (osx 10.12) and intelliJ 2017.1.4 with a german keyboard

In a scala project the editor replaces on scala files a typed dot(.) with  slash(/) and a comma(,) with Questionmark(?).
if i copy/paste a dot or comma it does not change.
i can't find any configuration to change this.
In other files like txt,css,js, the editor works as expected.

How can i change this it is very annoying!

thanks ,
Martin