I'm not disputing that it's happening to you Tailwinds, it just isn't happening to me so I can't offer any solutions. I fault find by making an error happen, then I work backwards to see why it's happening. Users find bugs that I've never noticed, but by following their actions I can reproduce them and suggest a fix. With this one, I can't get it to happen, although I feel that there might be a blank entry in one of the boxes, or the same aircraft being alerted twice because there is something common in 2 boxes maybe. I'm just fresh out of ideas at the moment, but there must be a cause that we haven't spotted yet.