  We experimentally study equilibration between edge states, co-propagating at
the edge of the fractional quantum Hall liquid, at high initial imbalances. We
find an anomalous increase of the conductance between the fractional edge
states at the filling factor $\nu=2/5$ in comparison with the expected one for
the model of independent edge states. We conclude that the model of independent
fractional edge states is not suitable to describe the experimental situation
at $\nu=2/5$.
