In the secret level of Howling Peaks: Colossal Rampart, there is a segment where you enter a building to find the captain and are tasked to find a key to open a locked door. I picked up the blue key but there were enemies blocking my way. As I was fighting them, the key that was on my back came of and suddenly vanished from existence. It did not respawn where I last picked it up and I even checked up and down the halls. I wanted this to be known so that other players do not experience the same issue and lose precious time getting through the level. (On a side note there are these strange enemy life bars on the right side of my screen.)