Forwarded Message does not Appear in AirDroid Client

I have an HTC One running Android 4.4.2. My SMS messages usually appear correctly in my AirDroid client (either the AirDroid 3 app or the HTML version). This morning someone forwarded me a SMS message that they had recieved from someone else and, although it appeared on my phone, AirDroid did not pick it up even after a refresh. Subsequent normal exchanges with that contact in the same SMS thread did appear.
Any ideas?