Hello I am on my Mac, in Firefox Browser. No extensions running. I tried to run it in a private browsing window, the red boxes persist. I had just taken a ranger level, and had the favored foe option chosen. I wanted to add it as a tracked resource, however, the phantom items started popping up, so I thought maybe the resources were trying to add a line into my inventory. So then I made the favoured foe an item to see if it did anything. It didn't. I just add an item using the little + button at the bottom of the inventory list. So far, no real impact on game play, expcet some of my custom items have stopped communicating with the sheet (eg one item gives me +2 survival, and it stopped showing up in my skills, had to add that in manually).