Hello Zulkarnain,
Though you are working on a low data rate and yet your eye diagram is not proper. Its strange. Could you please upload your .osd file because that way it would be more convenient to analyze what exactly you are doing. Can you detail about your other parameters that you are using for the transmission. Better would be to upload the .osd file so that people will help you accordingly. i Hope to se your problem get resolved soon.
Regards