Removing a 3 decimal point limit

Question

I've recently been making a calculator, and it was going fine until I ran into the issue where, when I add a decimal point, it makes it so I can only have 3 decimal points, rather then being able to do all the rest of the digits.

So I guess the main thing I'm asking, is there anyway to remove the thing that seems to restrict the number of decimal points, unless Number(string) and parseFloat(string) automatically restricts to 3 decimal points, then I have no idea what's wrong

I'm currently using 3 main functions for this:

var RemoveDigit = function(int) {
    var string = int.toString();
    
    return IsNumber(parseFloat(string.slice(0, string.length-1) + "" + string.slice(string.length)));
};//removes a digit

var convert = function(int1, int2) {
    var int = int1.toString()+int2.toString();
    return parseFloat(int);
};//makes it go to the next digit rather then just adding to the previous number

function insertDecimal(int) {
    var string = int.toString();
    return (string = string + ".");
}//inserts decimal

and then I go about doing the math and such, but I'd really like it if it wouldn't restrict the number of digits after the decimal.