Hi Tara18,
Apologies my advice above would be for QucikBooks Online, as you are using QuickBooks Self-Employed, the invoces are none-posting, meaning and invoices payments would not show on the reports and PL. The income recieved from the invoices should be recorded seperately on the 'Transactions' tab by creating a transaction to the category 'Business Income'.
Again, get back to us below if this does not resolve your issue :D