Hi Joe,
Those classes are used to indicate if Filter Bar should be open or closed.
Assuming no problems with caching, these should reflect the configuration set in Events → Settings → Filters with respect to the Default Filter State setting for all “new” visitors.
For a logged in or returning user, however, it should store their preference in a cookie (in other words, if the default state is “closed” and you then open the Filter Bar, it should remember this for a period of time).
Might that explain what you are seeing and do you have any other specific concerns about this?