It is pretty clear, that Solve is sorting the four solutions from smallest to largest.
Find the position of the inflection then, undo the sorting from there:
Ordering[resitve[[All, 4]]]
{8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15, 16, 17, 18, 19, \
.. 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101}
Test the new ordering, see if it looks smooth:
MapAt[Reverse, resitve, List /@ Range[8, Length[\[Lambda]]]][[All, 4]] // Ordering
{101, 100, 99, 98, 97, 96, 95, 94, 93, 92, 91, 90, 89, 88, \
.. 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1}
Apply the new ordering and rebuild the resulting processed solutions:
resitveOrdered = MapAt[Reverse, resitve, List /@ Range[8, Length[\[Lambda]]]];
Results now look like this:
