This is actually the reason. Unfortunately, it’s a side effect of how the replay system works. When viewing a replay, the app actually considers it as a normal flight/ATC session. The only real difference is that it reenacts parameters that were recorded for the specific session. This “issue” was even considered a bug initially during the Beta phase when the replay was first introduced.
Our hopes are to be able to improve on this, but it would require some fundamental code changes that we’re not quite ready for yet.