Duplicate scala with version name folder found in src/main directory Follow

Whether i am importing or creating a new Scala project, there is always another scala source folder created with its version name listed.

Here are the steps to replicate it:
1. Create a sbt scala project

2. Extra scala-2.10 folder found in
a. project/target.
b. src/main, src/test
c. target

I just want to be sure I'm not doing anything wrong before posting it to the scala plugin youtrack.

Thanks.