Hi, @tomzy_rulz.
You can still mark your invoices paid by clicking the Record Payment option.
If you don't see that option on your end, we can perform a basic troubleshooting step to determine if the issue is related to the browser you are using.
To begin, refresh the page by clicking the Refresh icon, pressing F5 on Windows, or Command-R on Mac.
After refreshing, check if your data reappears. If the problem persists, log out of your account and wait a few moments before signing back in.
Please respond to this post if you have any additional concerns regarding your invoice.