When going into a Crafting table, there will be Duplicates of items that you are able to craft and not quite yet. Picture explains it all. (Device in picture)
MCPE-9525
Item Duplicates in Crafting Table
Resolved
Duplicate
0
(Unassigned)
Unconfirmed
Phone - Android - Samsung Other (Specify in description)
0.12.1 Pre-release, 0.12.1 Beta 2
Retrieved
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This issue was reported previously as MCPE-9448. Comment your experience there!