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You may be experiencing a browser-related issue, thomasmarineinte.
There are instances that an issue like this can be fixed by running some troubleshooting steps.
To start with, let's update the invoice on a private window. It is the best place to identify any browser-related issues. You can use these keyboard shortcuts to open one:
If you can update it successfully, we can go back to a different browser and clear its cache. A piled cache can also be the reason for some unexpected issues on the opened pages.
We can also switch to a different browser like Google Chrome, Mozilla Firefox, Microsoft Edge, or Safari.
Also, if you want to let your customers pay the invoice online, you can check this article: Take and Process Payments Online.
Feel free to get back to me if there's anything that I can help. Keep safe!