FacebookStyleBarBehaviorDefiner with pagination

[cojoj]

So we have UITableView which is used in our app and FacebookStyleBarBehaviorDefiner perfectly matches our requirements, but we have one issue...
Our UITableView is aable to load more stuff - pagination. While we load new page contentOffset changes and BLKFlexibleHeightBar is presented out of nothing, which creates this weird behavior.

Looks like this code is responsible for what's happening:

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if(!self.isCurrentlySnapping)
    {
        CGFloat deltaYOffset = scrollView.contentOffset.y - self.previousYOffset;
        CGFloat deltaProgress = deltaYOffset / (self.flexibleHeightBar.maximumBarHeight-self.flexibleHeightBar.minimumBarHeight);

        self.flexibleHeightBar.progress = self.previousProgress + deltaProgress;

        [self.flexibleHeightBar setNeedsLayout];
    }
}

So when I log what values do I have there I've noticed that at some point deltaYOffset is negative when it shouldn't while I'm scrolling to the bottom. I've changed this, so I always get positive number there, but then I wasn't able to scroll to the top to see the bar again.

Any ideas how to solve this?