Double click in PAE does not always select column groups under the mouse

The PAE for epas1_human can be clustered to identify a helix around R850 with a potentially reliable predicted pose contact respect to the well predicted core domains.

Clustering the pae and trying to select the cluster containing R850 and M119 by double clicking in the PAE matrix sometimes selects all columns rather than just those under the mouse grouped by the tree partiion.