Same prb for me

[xhzengAIB]

I create the issue on other lib
izotx/JMCMarchingAnts#1 (comment)

[fdzsergio]

if you want to focus selected cell on tap, you can calculate the offset with following code

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    SFFocusViewLayout *focusViewLayout = (SFFocusViewLayout *)collectionView.collectionViewLayout;

    CGFloat offset = focusViewLayout.dragOffset * indexPath.item;
    if (collectionView.contentOffset.y != offset) {
        [collectionView setContentOffset:CGPointMake(0, offset) animated:YES];
    }
}

i've updated the example with this feature