[B.A.T.M.A.N.] Very strange behaviour

Hi, I'm just working on script that try to autorecover the node in case of failure and I noticed something very strange. Ii have 3 node setted to channel 3. Well when I change the channel of one of these nodes for example from 3 to 5 after some time I can see however the entirely topology of my network.

How it is possible? My script is not ready and iwconfig output show the changed channel!!!!

apparently do not have the same behavior if channel is far from other nodes (es 6)

This is very very strange for me!

Rgds