There is an underlying error causing this problem.
The game states all the worlds being played "Today".
Usually the game attempts to arrange according to when you entered the world. With this error, the worlds are in random order.
MCPE-8306
Worlds arranged in random order
Resolved
Duplicate
0
(Unassigned)
Unconfirmed
Phone - Android - Samsung Galaxy Ace
Android 4.4 KitKat
0.11.0 Beta 3, 0.11.0 Beta 4
Retrieved
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This issue was reported previously as MCPE-8291; comment your experience there!