The default view in Student Center only shows you a few of the available sections, so you might think there are only 5 or so available, as shown below. Click on the View All Sections text to have all sections revealed.
Default view of sections; View All Sections is highlighted as what you should click

After clicking View All Sections, you should see all sections, of which there are typically at least a dozen (screenshot from Jan 19, 2022):
All sections displayed