Let's make sure that we have selected the customise template, lindria.

The changes you've made will reflect on the invoice template you've created. We can verify this by clicking Customise on the invoice form. Then, selecting the customised invoice template you've created.

If you've selected the correct template, we can perform some troubleshooting steps to determine what causes this issue.

We can start by using an incognito window. This type of window doesn't store any file history making the page to load faster. If it works fine, we can go back to your regular browser and clear its cache. A piled cache can be the reason for some unexpected issues on the pages we've opened like QuickBooks.

You can also use a different browser. There are times that the current browser we're using has a page maintenance.

Please let me know how things work on your end.