Internet browsers use saved versions of web pages to speed up browsing. You need to force your browser to load the most recent version of the form.
Most browsers will load a new page when you hold down the Shift key on your keyboard while clicking the browser's refresh button.
You can always see the most recent version of your form by logging in and going to "Form Editor". Whatever is displayed in this section is the most recent version of your form. All updates are applied immediately to your form and there is never a delay.