55th FG vs. Luftwaffe on 11th June 1944 - wild over-crediting?

[Lagarto]

While analyzing losses and kills of P-38 units during the Normandy campaign, I ran into 11th June 1944. On that date 55th FG bombed marshalling yards in Compiegne, whereupon it was vectored to Beauvais, where it clashed with JG 26. According to this source: USAF Historical Study No. 85, USAF Credits for The Destruction of Enemy Aircraft, WW II, (Albert F. Simpson Historical Research Center, 1978 ), 55th FG pilots were credited with eight victories. Who lost those eight machines? Not JG 26, which scratched only one Focke Wulf after the scrap with Lightnings (source: Caldwell's JG 26 War Diary vol. II)
There was also I./JG 5 involved in the skirmish with 55th FG. Any idea if the aforementioned losses could be, if only partially, attributed to this unit? Or was there another air battle fought by 55th FG on that day?