Ezreal Bug With Muraman

Title/Video. Q costs 40 mana, hitting a "champion" consumes 3% of your current mana (3% of 2074 is 62.22), and muramana refunds 15% of the spent mana cost(1.2) 40 + 62.22 - 1.2 = 101.02, but as you can see over 130 mana is spent. Now, if you watch very closely, you see after the Q is shot, 34 mana in total was spent (meaning some mana had regenerated at the exact second of Q being shot), so 100+ mana is spent when muramana hits a "champion". 3% of 2040 is 61.2, so 40 + 61.2 - 1.2 = 100. Now, I have no clue what happened. But something is off with the damage dealt as well (285). Dummies have 50% armour basically, so about 570 total damage should have been launched. 115 + 214 (213.75 rounded up) + [61.2 * 2 (Cost of muramana's added damage doubled)] = 451.4 (or 451.15 to be exact). Meaning, there's about 120 damage that shouldn't be there. Ezreal's Q applies two stacks of muramana. 115 + 214 + [61.2 * 2] + [61.2 * 2 ] = 573.55 573.55 / 2 = 286.755 Not 285, but close enough.