I'll put up the maps for Legs 7-8 later in case there are extra locations at the start of Leg 9, but Leo/Jamal were shown getting lost
here,
here, and
here.
From Ballenberg, teams should have turned left to get to Oberschwanden for the archery task, which is just 4.2km/2.6mi away. Leo/Jamal turned right onto the main highway instead, taking a route that would have taken them 6.7km/4.2mi, but would still bring them to the right place.
While entering Brienz, Leo/Jamal panic and make a U-turn, compounding their error by going the wrong way along Lake Brienz for another 9.4km/5.8mi in the wrong direction. In total, they travelled more than 25.5km/15.8mi, six times as much as they needed to.