Question bank categories with backslashes in their name cause problems when exported in MoodleXML format. The backslashes are not escaped, and thus when the XML file is imported into another course the slashes are interpreted as path delimiters, nesting later parts of the title within earlier parts.

example: a category called "terms/concepts of psycho/neurolinguistics (T/F questions)" would get imported as four nested categories:
-terms
--concepts of psycho
---neurolinguistics (T
----F questions)