Open Horizons II Grid patrol problem

[HitLuca]

I am currently having a problem with the grid patroling using the Open Horizons 2 mod (with grid fix, aside other mods) and i am doing the second mission of the first campaign. I have to patrol the eastern coasts of England and i started with the request of patrol of grid AN5435. I found the place and started patroling but no ships are traversing my area of operations and if i sink the closer ones i don't complete the objective.
Before this i had to patrol another grid but after some time the order changed..
is this normal? I only have to guard that specific location and stay still till new orders or i do something wrong?

Here is a screen of the capitain's log, any help is appreciated



[UPDATE] Now i have been asked to patrol another area so i think i should continue with this, sinking ships entering the 80km radius but i would want to know if i am right or not