Hammer throw mana cost

Hi,
I am experiencing a weird behaviour regarding the mana cost of hammer throw.
The skill costs 0 mana. But when I spend all my mana and I am in negative mana state, the skill suddenly costs more. IS this normal? Shouldn’t it cost zero mana all the time?

https://imgur.com/a/ltTI8sI

Thanks

UPDATE!

After a respec of some passives and a restart the problem was fixed. Im not sure which one triggered the fix.

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