BuddyPress Integration Issue
I've encountered the same issue. The forum posts show on the authors profile activity but don't show on the site wide activity
What do you mean saying site-wide activity? Do you mean the BuddyPress Profile Activity tab?
Please see the wpForo Activity integration with BuddyPress Profile Activity tab in screenshot, it should look like this. Make sure in the drop-down you selected Everything:
And here is the BuddyPress Notification Integration :
wpForo BuddyPress integration for Activity, Notifications, Profile URL and Forum Tabs were tested about ten days ago for wpForo 1.7.0 and BuddyPress 5.1.x versions. All were fine and there was not any problem.