This happened to me too. I have rationalized the issue to the filters on the HDX vs. my iPad application. Don’t mean to hijack your thread, but my bigger concern is why the traffic altitudes showing on my iPad can be as much as 500’ different. I’m under the impression the HDX is feeding my iPad with the same data it’s receiving, so not able to understand how they can be different. Dynon pointed me to my EFB service, which in my case is Seattle Avionics - I’m using FlyQefb. Seattle Avionics talked in circles and never give me a rational answer. Do you see this issue too?