[GAMEPLAY]Jungle Item Bug

I was playing adc Vayne (arclight skin). I have Flash and Heal Summoner Spells, no smite. When I visited the shop, i found out that i can buy the Stalker's Blade Warriors enchantment. I tried to buy it, and as soon as i bought it, it disappeared and i can't get my gold back. I can't press undo. Please fix this thank you.