Two of my characters have too much Mana

I made a spread sheet to help me understand Mana mechanics better. Mostly to theorycraft builds. Max mana on two of my characters is off. They have more mana then they should have.
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Max Mana Calculation: (for a naked character)
Base Mana 40
+4 Mana per level (excluding level 1)
Int/2
(Max mana passive, deep thoughts forex:) - neither of my "bugged" char have that type of passive

Multiplied by: increased maximum mana passives
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Example 1:
My Witch: Is Level 52 and has 250 Int(naked). Has 20% increased max mana from passives.

((base mana) + (Level Mana) + (Int Mana)) * (increased max mana passives) = Total Mana
(40 + (52*4-4) + 250/2) * 1.2 = 442,8

Yet: The max mana is 539

Should have 443 mana; Has 539; 96 extra mana

Example 2:
My Ranger: Is Level 61 and has 34 Int (naked). Has 8% increased max mana from passives.

((base mana) + (Level Mana) + (Int Mana)) * (increased max mana passives) = Total Mana
(40 + (61*4-4) + 34/2) * 1.08 = 320,76

Yet: The max mana is 364

Should have 321 mana; has 364; 43 extra mana


Is this a bug or are my calculations wrong?

PS: I've made this calculation for all my characters and so far everything has been correct except for those two examples.
-HC player
Had a signature RiP list but it just to long now :)
first character took 2x40 mana from bandit and the second character took one 1x40 mana from bandit
http://poetools.com/ - PATH OF EXILE TOOLS
Thanks alot kompo. Glad i was wrong there :)

Totally forgot about the mana bandit! I usually just help my bro Oak or kill'em all.

-HC player
Had a signature RiP list but it just to long now :)

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