(edited by Kilamanjaro.1830)
Deleting items in Windowed mode
“Heroes Are Rare, Become One.”
Is it possible that when you switched back to GW2 you hadn’t actually activated the window and it for some reason then treated left clicks as right clicks? I’m assuming you weren’t accidentally holding down the control key xD?
(Also you can’t have images in your signature, I’m guessing that is what you’re attempting to do? – it’s for appearance reasons)
There is a bug that will cause a certain button to stick (as an example, if you try to use a waypoint or a skill, instead of activating, it will link it in your chat window when you left click… As if you were holding that button down) When this occurs, intentionally create the behaviour, I.e. control+left click something to cause it to link in chat, this usually fixes the issue.