That is how with ghosting logic works. It trends your current Alt, Speed, Track and then looks at other planes directly around you to filter them out. A wingman is going to get filtered as it is a known traffic. Would you want him/her to be popping traffic alerts the hole time? If he began to change altitude, speed or directly more quickly, it would show.
Unfortunately, at this time there is no perfect way to determine yourself differently from another ADS-B traffic report. If it was all ADS-B out traffic, it would be easier, but with Mode C, Mode S, there is not a common denominator to determine this yet. All the ADS-B out, in makers, and app developers are working through this... I hope this helps.