Hi Subhash,
According to your question about the mismatch between eye diagram and constellation diagram, what do you exactly mean by “mismatch”? In other words, it would be preferable to see your screen shots to better visualize and understand your question. Could you, please, upload them? I agree with you that there are may be a few settings that can be corrected/changed. As a forum member, I will be glad to give you my advice according to your query!