I cannot take my gift to make a trade on my shop

http://dispenser.tf/paygames

I have the same problem, when I click the item, then the +Trade button it lags a bit then opens this duplicate dispenser.tf page. http://gyazo.com/d3ca9be8c4f85774b5c85aed2018ea16 . When I try to do it again, it just keeps recreating duplicate pages. Editing trades work fine though