I was looking at the predicted flight path for UA106 from IAD to MUC and noticed this odd pattern. Why would it do this? I understand that most flight paths are not straight and there are airways that most all flights follow, but this path makes two less than 90 degree turns. Wouldn't it be simpler to go straight to the Belgium point rather than go to Poland, then back to Belgium, then back again to Munich?
As @mins suggested, it seems to be a wrong longitude of a waypoint in the Shannon Control area. I assume it is a hemisphere error (they used East instead of West). If the longitude of the waypoint is mirrored with respect to the Greenwich meridian, the resulting path gives a more likely route to be flown: