When you import MARCXML fields 6xx that contain subfields such as x and v, the subfield term is prefixed by a colon. For instance, if the MARC data is:
600 10 Anderson, Caroline$vArchives
When imported, the agent name is imported, but subfield v is added as a linked term and imported as:
: Archives
The colon should be removed. This bug appears on line 457 of marcxml_base_map.rb:
term.term = "#{prefix}: #{node.inner_text}"
The "#{prefix}: " part should be removed. I don't believe there is any reason for this to be in the importer.
Any
The Metadata Standards subcommittee concurs that this is a bug and the colon/#prefix should be removed from the importer.