Hi Dheva Raja,
We are experiencing the offset shadow in the right eye on our systems as well. For unknown reasons, real-time shadows in Unity fail to render properly when our specialized frustum matrices are applied to Unity's stereo camera. We're continuing to ping Unity about it, but currently have no time frame for when this might be resolved. I will file a new bug report with unity this evening since we're continuing to experience the behavior in the new Unity 2018.1.0f2 as well.
While we do see the shadow offset, I'm unfamiliar with the negative image issue you mentioned. I'd be interested in investigating that as well. If you can provide an image capturing the issue, or even better, a simple Unity project/scene that reproduces the issue, I'd be happy to investigate.