If you look at the bottom side of the leaves you'll see lot of ants. They are mostly stationary. Wonder what are they up to
If they are damaging the climbing plant then they must be doing it realllly slow because they've been there for days and no significant damage to the leaves.
If anything I am sharp decline in caterpillars feeding on the plant though I can't tell if its because of the ants or because I am so good at picking them up