Why is Erementar Gerad listed as the side story when it is longer and came first? Should it be the other way around?

That's an evident mistake. It's very likely that the person who made the entry wanted to list Erementar Gerad as a side story of Flag of Bluesky but he/she wasn't aware that doing so would also update FoB as a "Main Story" of Erementar Gerad (That's a very common error that people who is not very familiarized with M-U system make.)
For me, Flag of Bluesky looks more like a spin-off rather than a Side Story (in fact, I think that most manga sites name it like that) so I'll label it as such. Do you agree me or do you have something else on mind?

[img]http://img246.imageshack.us/img246/9226/resizedsignatureal3.jpg[/img]

Thanks, I think it makes more sense now.

You know, you guys can change the series info yourselves if it's wrong. So you're helping out the community a lot of you spot mistakes and correct them yourselves.

A just ruler amongst tyrants