I added the signature on June 06 and have left it in place since then but just realized there are separate claims for different months, was there something I needed to do to get it for multiple months? I've been approved for 100 eggs in the bounty system - is that just one month?
yes. 100 Eggs in one month for 20 posts. as you are saying your 100 eggs has been approved so now you don't need to do anything else but just write 20 more posts in this month for claim your reward in next month.
it is that simple dude.