so i have a question to riot about Sivir

i was testing ap sivir. i use to play her ap back in the day. and looking at the scaling i dont understand. i remember it saying magic dmg instead of physical. but it got nerfed a bit into a .5 ratio. i had over 600 ap in a game. but in game results shows my magic dmg was only 5000 dmg during the entire game. i rarely miss with boomerang. but when i go to physical it says i did a bunch of physical. but i had no ad items built morellonomicon, spell boots, deathcap, zonyas and banner of command, void staff i put pictures below to show the dmg after the game. some how it seems my dmg was converted from magic completely to physical. but magic pen was not working