These 2 number cant add up

JavaScript
1

attached image
Code snippet

           for (var i = 0; i <= 22; i++) {
	   		        var incbidsize = -11 + i;
				var buyprices = buyprice + (bidsize * incbidsize ) ; // this is to start from backwards  
                                var newprice = buyprices ;

Variable are taken from a form element
Just do not understand why cant the variable add up ?

var newprice is the 1.32 you see in the 1st column
i want it to increment by a variable instead of usual ++
the first value should be (1.32 - 0.11) = 1.21
second value should be 1.22

i try changing them to number using parsefloat
or change both to string using toString
but it does not work

other variables are adding correctly