I had joined translation campaign as well as moderating thread for a few projects before but I don't know how bounty manager count exactly my posts of anyone from a thread. Any ideal for this issue?
What exactly do you mean?
I believe that signature managers simply go to through your post history to see if the posts you made were viable, (and complied with the rules given to posting). They don't look through every single thread in the forum if that is what you mean.
This indeed might be different for ANN threads, where say for example you need to make 1 post a week, but i believe this is against the rules ( self-bumping).
I got confused too, but if you are asking how campaign managers count all your post in regards to their campaign, then he could just jump over your profile>show lats post then count your post there for the current period.