[Gameplay] Unable to sell and purchase another item

Game link: https://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2744230758/232556889?tab=overview

Bug: After the 25th minute mark, I am unable to sell my items. I tried multiple times to sell my boot and my dark seal. The sell button works, but when I close the shop, the item appears back in the item slot. I also tried to sell and purchase another item (sell ionian boot for sorcerer's shoes), it will not will not let me do that. I believe this is the first time that this has happened to me. It was unfortunate because all my item slots were full and I couldn't sell any items so all I could do was purchase elixir.