It might happen that some airports ICAO are too close each other, and the area dedicated to those airports might overlap, and one can take priority over the next one. If it happens, as for example the following WSSS and WSAC, open a ticket to support obviously. At the moment, this particular case Link has been fixed.
In the meantime, before help desk solves it, if it happens with other ICAO’s you can try to change depart airport ICAO, to the one next to it.