The content in each filter category do not appear to follow an Ascending or Descending arrangement.
Under Organizer and Venue they appear to display in a random order, not alphabetical. (checkboxes)
Under the Event Category they are displayed in Descending alphabetical order. (drop down and checkboxes)
No settings within the Filter admin panel to choose or change the display of this information.
OS 10.7.5
Safari 6.0.5
Wordpress 3.6.1
Theme: Avada 2.1.3 (themefusion)
Plugins: Events Calendar Pro 3.0.5, Events Community 3.0.1, Events Category Colors 3.0.3