UPDATE by @unknown: Still affects cauldrons as of 0.17.0.2. (Also occurs with potions and water bottles.) Fixed for just placing water/lava in the world, though.
Whenever you place water or lava in creative, the water/lava bucket you use is not consumed (as expected) but an empty bucket is returned and eventually fills up your inventory.
Steps to reproduce:
Discard any empty buckets you already have.
Put water somewhere.
Now you have 1 water bucket and 1 empty bucket.
Put another water somewhere.
Now you have 1 water bucket and 2 empty buckets.
What I expected:
No empty buckets are returned in creative.
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Comments


@unknown, that's because water/lava buckets are non-stackable unlike empty ones. See http://minecraft.gamepedia.com/Water#Water_Bucket

Confirmed for 0.15.1 alpha build 1. Also, in creative mode, filling cauldron with potion and water bucket or drinking potion, will give you an empty bottle and empty bucket.

Still occurs in 0.15.2.

Confirmed for 0.15.7 on Windows 10.

This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).

Affects 0.15.10. (Tested on Windows 10.)

Affects 0.15.90.8 (0.16.0 beta build 5).

Partially fixed in 0.17.0.2. Still occurs when filling cauldrons... also just discovered it happens with potions/water bottles, too.
Affects 1.0.4.1.
Affects 1.0.5.0.
Thank you for your report!
However, this issue has been closed as Won't Fix.
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What's really strange is in creative you don't get 64 of the water buckets like you do with other items and every time you empty out a bucket; it gives you an additional empty bucket each time.