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understand netflow info


I enabled netflow on some of my ISR G1/2 routers but on some of them I don't understand output.

In dest interface row, more often I can see : gi0/1, tunnelX.. but sometimes, I see "null0" and "Local".

What I understand is that null0 is because I have some static route to null, so OK.

About "Local", I can understand to see it when dest is inside interface (I have only Gi0/0, Gi0/1 and tunnelX interfaces), but in my case more often when I see "Local" it's not the inside IP... why ? is it a bug ? any idea ? packet on network IP or broadcast IP ?

example : router with Gi0/1 =

and what I see with netflow : (Gi0/1)=> (Local)1.64 Mo  | TCP        => why Local ??? (Gi0/1)=> (Local)196.51 Ko  | UDP         => why Local ??? (Gi0/1)=> (Local)4.73 Ko  | TCP        => why Local ??? (Gi0/1)=> (Local)1.8 Ko  | UDP               => here seems normal (Gi0/1)=> (Local)1.78 Ko  | UDP             => here seems normal

IOS on routers : 15.1(4)M7 3825

could it be an issue with netflow when there are ACL to log all traffic ? because on most of my routers, it's ok, only few have problem, so I try to undertand.