A wild guess you have names with ,
From http://wiki-en.genealogy.net/GEDCOM/NAME-Tag
E2 Allowed characters in NAME
According to the agreements for CHAR following characters may be used for <NAME_TEXT>: All chars of UNICODE except:
- Slash "/" , reserved for separation of surname from other name parts
- Comma ","
- WHITESPACE chars
- Solely accepted of the WHITESPACE chars are space and protected space U+00A0
