Can any one help me out? I am receiving upvotes on my answers and questions but reputation is not getting added.
Please have a look at the below imags:
Is there any limitation that I am not aware of?
There is a rep cap.
On this day, you received over 200 reputation on Salesforce Stack Exchange. There is a cap at 200 rep excluding bounties and accepted answers. After you hit this, you cannot get any more reputation from upvotes. See also What is the daily reputation cap and how can I hit it?.
The reason you received more than 200 rep is because one of your answers was accepted (+15) and you accepted an answer (+2).