Aether/Æther

Why are there two copies of all cards who's name start with Aether (e.g. Aether Figment/Æther Figment) in mtg.cards?
The ones starting with "Aether" works just fine in the deck editor and while playing.
The ones starting with "Æther" show up as "Æther" and their images do not work. I guess because there simply are non named after them.
Is there a reason why there are two versions?
Since there are two version does that increase the chance of them showing up in drafts? I have had both the working and non-working versions pop up in boosters.
The ones starting with "Aether" works just fine in the deck editor and while playing.
The ones starting with "Æther" show up as "Æther" and their images do not work. I guess because there simply are non named after them.
Is there a reason why there are two versions?
Since there are two version does that increase the chance of them showing up in drafts? I have had both the working and non-working versions pop up in boosters.