Why is it after I unhollow, use Humanity and kill things, I gain Humanity?

Why is it after I use Humanity, unhollow, and kill things, I gain Humanity back in the upper left hand corner?
Best Answer
There are multiple ways to gain Humanity, one is using the item, another is recovering your bloodstain when you had Humanity in the counter.
The third way (the one you are describing) is to kill humanoids. After a number of kills you will gain a Humanity. Each area with humanoid enemies can grant 10 Humanity this way, but only if the area boss is not killed.
As Yuuki has mentioned, some enemies drop Humanity as an item. Rats are quite good for this, though there are better enemies later in the game.
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What is the point of restoring humanity in Dark Souls?
Regaining Human form costs 1 Humanity point, which can be spent at a Bonfire. Human form will allow players to summon Phantoms for help and guidance on their journey. Human form will allow players to invade another player's world. Human form will also leave the player open to invasions by hostile Black Phantoms.How do you gain humanity?
How to get more HumanityDARK SOULS - Humanity Explained (Reverse Hollow, Kindling, Holding Humanity...)
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Answer 2
To add to what others have said, not only will certain enemies drop humanity as an item, the higher your humanity the better drop chance you have. The cap is 10. Equip some item find gear and grind away. You will more than make back those 10.
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