Game Mechanics: Mana regen issue/question

[Tuanta]

Forgive me if this has been covered. I'm not seeing it mentioned.

I recently started playing and have a new lvl6 Halfling Druid
I notice my mana drops a point before increasing every tick.
Is this normal?

Example: Sitting with spell book open. Mana goes from 74 to 73 then jumps to 75.
This happens every tick of natural mana regen with no mana regen buffs.
-1, +2, -1, +2, -1, +2, -1, +2, ...

Thanks in advance.