Let me help you investigate this issue with pop-up message that keeps on asking you to create an invoice.
Since we haven't been receiving similar reports about this, we can try a couple of basic troubleshooting steps to isolate this issue. Let's begin with using a private browser or incognito window. This is to know if it's a browser related issue. You can refer to the following keyboard shortcuts:
If this works, let's try clearing your browser's temporary cache and files. Check out this article for instructions: How do I clear temporary internet files and cache?
If the same thing happens, I recommend contacting our Care Support Team for them to take a closer look and conduct further investigation.
Keep me posted on how it goes. If you need anything else, please feel free to come back and leave a comment below.