If the company logo still does not show in your invoices, I suggest logging in your QuickBooks account using a private browser. This way, you'll see if you get the same result. And, to verify if the issue is caused by a full cache.
Use these keyboard shortcuts based on the browser you're using.
For Internet Explorer of Firefox, press Ctrl + Shift + P.
For Chrome, press Ctrl + Shift + N.
For Safari, hold down Command + Shift + N.
If it works in incognito, I recommend clearing the cache of your regular browser. This removes the history or log of sites so you can start with a clean slate. You can check this article to see the steps: How do I clear my browser cache and temporary Internet files?.