We think this has to do with the extension, but it also may be the template.
We are using Travelkit with SPBOOKING and a few other 3rd party extensions.
We just launched the site Live to the public this week.
We always protect our 'administrator' directory under Joomla
It seems after we did that, when website visitors click on anything related to SPBOOKING, they are prompted for credentials.. We must have this fixed. We will NOT be removing protection for the administrator folder structure.
Is something referenced or linked in the administrator folder when SPBOOKING is called for a page?
please see the link to reprocude the issue