Ignore spaces in numerical validation

You can add this JS to take care of that:
Qualtrics.SurveyEngine.addOnReady(function () {
    let qc = this.questionContainer;
    document.querySelector("#NextButton").onclick = function () {
        qc.querySelectorAll(".InputText").forEach((input) => {
            input.value = input.value.trim();
        });
    };
});

The validation will still fail if there are spaces between numbers.