I have the following code: https://codepen.io/ion-ciorba/pen/MWVWpmR

The problem is on "Suma solicitata" value, there you can click and edit the value, but when trying to replace a number inside the whole one, the newly replaced number will go to the end of it. How can I fix this, I think it's because of that:

var preventOnlyLetters = function (event) {
                    $(this).val($(this).val().replace(/[^\d]+/, ""));
}