I just started with Quickbooks and I'm having the same issue.  However, for me, I am entering multiple invoices for the same vendor.  Some will be added together and marked "split", but they may leave one of the added invoices added in the "split", but still leave that invoice as a separate item.  This is totally unacceptable, this is the main function we want Quickbooks for and if we can't see our items at a glance, we will cancel.