jquery - Need help for parseFloat Values addition

I have 2 divs

Its value is updated onclick

0.0301

This is main balance div
I am trying to update

by adding both divs in this way

var totalscore = $("#balance p").text();
var currentscore = $("#cursoc p").text();

 var bal = parseFloat(totalscore) + parseFloat(currentscore);
 $("#balance p").html(bal);

Ins start it adds correct but After few clicks instead of adding it puts value after the balance like 0.00301000008 instead of adding 0.00301 + 0.000008

Am I doing parseFloat wrong way, need to know what is causing this