Guinsoo's Rageblade ，The weapon is gone

That day, I play Zhao Xin , the second equipment in the game I buy a Guinsoo's Rageblad e, and then the third piece of equipment I buy Hexdrinker . then the Guinsoo's Rageblade was gone, but in the store shows that I have purchased, there is no way to buy again, but it is notGuinsoo's Rageblade properties, and attack speed, but I have no way to buy again.