It seems these records have many wrong entries. For example, the BOOMERANG BETSY, 42-64347, pilot Markham. As mentioned above, it crashed in Bulgaria and most of the crew became POW, but MACR search result shows ITAly
In fact, for 18/05/1944 in Bulgaria were reported the following crashes of "enemy aircraft":
1 at Bardarski Geran /B-24 bomber/
1 at 5.5 SW of Gorno Peshtene /10 burned bodies found, so it is a bomber/
1 at Knezha /B-24 bomber/
1 at Kostelevo /bomber/
1 at Rila, 5 km SE from the village of Gherman /one burned body found/
1 at Smochevo /P-38 Lightning/*
and 1 at Prilep, Yugoslavia, which was under Bulgarian control at the time
*
P-38J of pilot Wingert, Paul J, as listed here: http://raf-112-squadron.org/14thfghonor_roll42_43.html