Why is my total sales figure not accurate?

I have the Shopify app downloaded and I also refreshed the Shopify website and as I been getting orders my Shopify total sales hasn’t been accurate. But it still says that the payments went through and tells me what day I will be receiving my payouts. Also I’m not using any third party apps that should affect my total sales. Can anyone help me please I will like to keep track of my money without calculating myself