You can check the database here
http://www.ahs.no/ref_db/lw_summ_los...iew.asp?PAGE=1 for this date.
There are several losses for JG 1 especially, with two for I./JG 1 of which I don't know the meaning of the "loss cause code" (18 and 19), another of I./JG 1 without enemy action and two losses of II./JG 1 in air combat.
The JG 1 book by Mombeek list only two losses:
_ Gefr Bernhard Boose of 1./JG 1 was killed when his Fw 190 A-7 WNr 430175 "white 23" crashed near Ostbüren during a transfer flight.
_ Ofw Gerhard Fleeming of 9./JG 1 was killed when his Bf 109 G-6 WNr 410881 "Yellow 4" was shot down in an air battle and crashed near Wachtum.
So one loss for I./JG 1 and one for III./JG 1 in the book, compared to 2-3 losses for I./JG 1 and two for II./JG 1 in the Luftwaffe loss summary.