Why does the StackExchange website dropdown list randomly the sites I have <200 rep on? Please make the sites I have <200 rep on be sorted just like the sites I have >200 rep on.
We don't feel that users have shown a strong "preference" for a site until they earn 200 reputation on it.
Therefore, we present the list in random order until you have at least 200 reputation -- this encourages cross-pollination in the network and helps users discover new and interesting sites as they browse around.
Remember too that you get +100 on every site once you cross the +200 threshold on any site in the network, so +200 is not very hard to achieve on many sites.
(and yes, the above is now automated, thanks to Kevin.)