Two expansions are for low level characters and they can be accessed from Matras.
The other eight are from Mithria.
Have you deleted any expansion after being enabled? Expansions must be installed on Android (and enabled) for them to register. (You can however delete the expansion's obb files, reclaiming most of the space. See:
viewtopic.php?f=3&t=4669)
Your character's level has no influence on what expansion you can travel to (although you can get stuck, in some expansions the way back is not where you arrive, so it's recommended you always keep a save somewhere safe.
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