here is the bug make a 3×3 wall any type of blocks and fill with item frame in item frame you place map it will not show 3×3 map instead it will show the map 1×1 in 3×3 item frame
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A map will only fill a single item frame regardless of the Zoom level.
If I'm reading the report right this is working as expected.
If you believe I've misunderstood please have a read through http://help.mojang.com/customer/portal/articles/801354-writing-helpful-bug-reports-for-minecraft and provide more information in a subsequent report.
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This is the way it should be. You should make the maps individually in the area you want it to display.