seems like the scripts for extended infos have a little problem at discnumber, track temp & mixartist with single track releases. it writes the correct information, but it is followed by "|". If no information is present at these tags, there is only "|".
examples:
http://www.discogs.com/release/1741359
http://www.discogs.com/release/1311495
http://www.discogs.com/release/1941108
could not figure out what causes the problem