[Spoiler] The complexity of a rune is inconsistent in single and multiplayer games

[IanTheWizard]

Attention: This thread contains a minor spoiler.

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I got an Extra Energy rune in the single player game (from an orc seer) and found that the complexity of the rune is 5.

But in the multiplayer game, the complexity of the Extra Energy rune is 4.

Is that inconsistency working as intended?