Mana cost rounding errors.

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What platform are you running Path of Building on?

Windows

What is the value from the calculation in-game?

1. Craclking lance of Disintegration level 3 (15 base mana cost) with CWDT support (2.5 multi) + enhance (1.2 multi) + conc effect (1.4 multi). Total mana cost should be 63
2. Craclking lance of Disintegration level 2 (14 base mana cost) with CWDT (2.5 multi) + enhance (1.2 multi) + archmage with 850 max unreserved mana. Total mana cost should be 168

What is the value from the calculation in Path of Building?

1. Craclking lance of Disintegration level 3 (15 base mana cost) with CWDT support (2.5 multi) + enhance (1.2 multi) + conc effect (1.4 multi). Total mana cost should be 63, but its 62 in POB. In the calculation tab it shows that it multiplies by 4.19999.
2. Craclking lance of Disintegration level 2 (14 base mana cost) with CWDT (2.5 multi) + enhance (1.2 multi) + archmage with 850 max unreserved mana. Total mana cost should be 168, but its 171 in the POB. In the calculation tab it shows that base mana cost is 57 (14 + 43). 43 comes from Archmange support with 850 unreserved mana. 850 * 0.05 = 42.5. So total base cost should be 56.

How to reproduce the issue

1. Craclking lance of Disintegration level 3 (15 base mana cost) with CWDT support (2.5 multi) + enhance (1.2 multi) + conc effect (1.4 multi). Total mana cost should be 63
2. Craclking lance of Disintegration level 2 (14 base mana cost) with CWDT (2.5 multi) + enhance (1.2 multi) + archmage with 850 max unreserved mana.

PoB for PoE1 build code

https://pobb.in/vUucOnSt7-P4

Screenshots

No response

Start by loading the linked PoB build code and reproducing both cases in the Calculation tab, focusing on the mana-cost calculation and its rounding behavior. Done means Path of Building reports 63 for the first setup and 168 for the second, matching the in-game values.