So right now now, every time you visit a bonfire your estus flasks get refilled to 5. When you kindle a bonfire they can get refilled to 10. You need to be human to do so and use another humanity to kindle the bonfire.
I'm guessing you haven't kindled a bonfire yet so the reason why your estus flask count is moving up is because another player on the server you're playing on kindled a bonfire. When someone kindles a bonfire, everyone who recently visited that bonfire gets an extra estus flask.
Later on in the game (much later), you'll get the ability to kindle a bonfire 3 times so you'll have 20 estus flasks.
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