Our system displays membership levels on the signup form from the most expensive to the lowest cost. Although this seems counter-intuitive, it is actually a conversion technique designed to maximize your signup rates, using an effect known as Anchoring. By anchoring the visitor with the more expensive option first, the lower cost options appear more reasonable and attractive.
If you prefer to specify the order the membership levels appear, replace the shortcode/snippet on your sign up page. When obtaining the new shortcode/snippet, use the "Optional - display only following levels in order selected..." feature. Click on each membership level in the order you want them to appear. Each membership level should turn blue when clicked on.