Public groups are designed to show up for users regardless of join status as they are public and do not require an invite to join. Are you sure the channel(s) that you’re expecting to show up are in fact public?
It would be best if you could DM me your App_ID and the Channel_Url of a channel you expect to be returned in the query so I can double check. Additionally, if you could obtain your entire query and share it, that would be beneficial.
