Drink affects mana regen while food affects health regen so make sure you aren't out.
It's also likely you're not sitting the entire duration of 6 seconds to receive the server "tick". You'll see the number as a higher value ie: your mana is showing 24 while sitting, you stand up and suddenly it drops to 19. Latency might also be causing you to not receive the "tick" since you need to be synced with the server properly (don't quote me on that).
If none of the above is an issue then you have a more serious problem. Good luck!
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Grodd - Shaman
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