'Cos you see, Lawson on the ?????? front is an original doujinshii and same for a few others. According to mangaupdates, they're all recognised as original series and not as DJ. However, it's kinda weird 'cos they aren't really released by the manga publishing companies and printed instead, by other sources.
Edited by Undead Tofu, 23 September 2011 - 09:20 PM.