Sales invoices and daily receipts added together when calculating results

Why would you do that twice? First read the article about daily receipts, that will clarify a lot.

I would delete the daily receipts, since you have already created those sales invoices and sent them to your customers?It's easier to delete those daily receipts; you just have to do it yourself. The sales invoices are already with your customers, so you would actually have to create credit notes... a lot of hassle. It's easier to delete the daily receipts. Just mention the reason why (required, Dexxter also questions this).