CONC and CONT are GEDCOM codes that are used to continue tags from one line to another. The rules of GEDCOM allow only specific tags to be continued to additional lines, most "fact" type tags do not qualify for continuation, and as stated "fact" tag also has rules that dictate what tags can have data following the tag and what tags can not. It looks like RM violates this simple set of GEDCOM rules as does FTM and probably a few others.
Looks like I will not be using these products either!!