Thanks for the extra info.
As I suspected, these events are published with the QR Code prefix as "
http://www.maprunners.com.au?c=". This is the default setting.
MapRun6 takes this prefix strictly as a string to match with the code it reads from any QR Code that is scanned.
Your QRCodes are produced with the prefix shown in your screen shot:
http://maprunners.com.au. That is, the www. is missing.
Although these two strings would resolve to the same URL in a web browser, MapRun6 allows QR Codes to be any string eg "MyFavouriteEventControl-S1", as long as the setup for the event matches the actual tags in the field. So we do a simple string match to confirm that the QR Code scanned is one for this course.
The easiest fix in this case would be to delete the event, and then republish it with the QR Code prefix that matches those on the course, that is:
http://maprunners.com.au?c=We'll check in with Michael to check that the default in the tool aligns with the default in MapRun.
Peter