Generators runs even with battery fill policy

I dont know if its a bug or i dont know how it works but, the hydrogen and coal generators were all on whatever battery fill policy you check.

example: if you choose 50% battery fill, its supose that when the generator recharge pass to 51% it automatically should shut down, im right?? or in the other way it should turn on when the battery power goes below 50%.

It show that its always on whatever you choose.

Thanks in advance. Sorry for my bad english