Kayn & predator

i took predator on kayn this game and well, the shop was broken. my boots of speed icon was blanked out and all items were full price even if i had the items for it to be cheaper and i only could buy the item for example warrior if i had around 2625 gold (full price) i could finally buy it and i had all the components but it only took around 500 of my gold. idk what happened but its something with either kayn predator or both.