Hello there, @sychan.
Thank you for posting here in the Community. I can provide some clarification about the sales forms in QuickBooks.
You should be able to add punctuation marks like a single quote or apostrophe on an invoice template. Since you're getting a different result, the browser's stored cache may be full.
It can cause unusual behavior in QuickBooks, like the garbage sign when typing the company name. I'd first suggest logging into your account using a private browser.
This process allows you to access sites without storing any data in the cache. Thus, it's a great way to isolate browser-related issues.
If you're using Mozilla Firefox or Microsoft Edge, press the CTRL + Shift + P shortcut on your keyboard. For Safari, hit Command + Shift + N. Press CTRL + Shift + N if you're using Google Chrome.
From there, please attempt to add the name again and check the outcome. If it works, let's clear your browser's cache to have a clean slate, so it'll function efficiently.
In case private browsing doesn't work, use other supported web engine to get the best and most secure experience with the program.
For more information, as well as how to personalize sales forms in QuickBooks, I recommend the following article: Customize invoices, estimates, and sales receipts in QuickBooks Online.
Please let us know if you need anything else. Keep safe.
