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kotlinlang

In Android Studio, I have two directories java/ and kotlin/. When I &lt;Convert Java File to Kotlin&gt; and then move the file from the java package to the kotlin package, after restarting AS the .kt file exists twice in both directories and is marked as green (so added to git).
I had another issue where suddenly a whole new directory I created in another branch was suddenly added as new files (also green as in added to git) into my current branch without ever merging. I only used the “Checkout branch” function from AS. It only ever happened with Kotlin files but from the second incident I would assume it has something to do with the Git plugin. 
Has anyone had similar issues?