something similar happened to me, but I bought more of what was set to 0, so it didn't end up being a problem in the end. If it's getting on your nerves, you could try to buy a single one of the cheapest element and then proceed to sell it. I think that would clear it off, but I'm not sure. If it does, then just do that for the rest of them that aren't that expensive as well and you can free up room