Not sure where to report a bug, hence noting it here.
In 3.7.1 Skyview, when the gear wheel is selected and the units are changed, then the ‘Other’ (dark blue) rows without a reported altitude disappear from the list. (ADS-B, MLAT and TIS-B are not affected). With the rows removed, the aircraft count changes accordingly.
Workaround: Reload the page
Thanks for the heads up. We’ll get that sorted out.