Hey Bounty manager, I have a similar issue.

My starting posts were 154 & according to the sheet I made 563 posts in total that brings my posts after entering the bounty-campaign on 409 posts...

Actually my current total posts (including this one) are 660 so that would bring my number of posts after entering the bounty-campaign on 506 posts, which is almost 100 posts higher than the calculation from the bounty-sheet...