Thanks. This looks like a bug where some flights are being upgraded from position-only to regular flights incorrectly. There is a fix for it waiting to be deployed, so it should be fixed for future flights shortly.
You can see this effect if you compare e.g. https://flightaware.com/live/flight/N71 ... 0105/0010Z
with https://flightaware.com/live/flight/N71 ... 0103/2312Z
. The second flight is position-only and you will get the yellow banner warning you that it's position-only (or it won't show up entirely if you have them disabled). The first flight has been (incorrectly) upgraded and there is no yellow banner.