Save results in grep buffer gets messed up between git projects

If I'm in one git project, for example with name "foo", save a helm grep buffer,
the default-directory is "path/to/foo"

But if I go to a different project: 'bar'.
Then the default directory is still "path/to/foo"

If I kill the buffer, and try again, it still remains.
This is annoying when using compilation-mode and trying to jump to the grep file since the directory is wrong.
