The only "possibly authoritative" sites I find in Google results relating to the phenomenon appear to be concentrated around ".ca" origins (Canada). As past attempts by most of the rest of us at understanding almost anything relating to that region have been completely hopeless, I guess we'll have to leave it up to Max to decide whether an explanation is merited, or whether it's a fluke that just needs to be fixed.

Several sites appear to be instructions about using specific programs/applications peculiar to a particular organization (several are schools, but a couple of "municipal" orgs also appear) and the fluke might have appeared here if someone thought that mudcat works the same way as their usual site. None of those give sufficient information to identify whether the "feature" may be peculiar to Java or CMS coding, although both are mentioned on various of the sites.

John