[B.A.T.M.A.N.] Bad link quality if routers are connected by 2 interfaces

Hi,

in our Freifunk network we are experiencing some kind of strange behaviour if two routers can see each other by wire and wireless at the same time. Then the link quality in the originator table drops from normally >250 to somewhat around 130 or less on both interfaces.

Because we have no idea why this happens but think this is kind of unwanted behaviour I´m asking here if we did something wrong or if we missed some configuration in this case.

We are using B.A.T.M.A.N. adv 2013.4.0.

Kind Regards Clemens John