Welcome, @Pete4.
Thanks for posting here in the Community. I'm here to help fix the issue you're having when entering Weekly Timesheet entries in both QuickBooks Online (QBO) and Mac app.
I tried this on my end but I'm not getting the same results. I also check if there are any reported cases similar to this but there isn't. To isolate this, try logging into your QBO account using a different browser or a private browser. Your browser's settings or old cache might have caused this unexpected behavior while using QBO. To use a private browser, here's how:
- On your keyboard, press Ctrl + Shift + N (Google Chrome).
- Ctrl + Shift + P (Firefox or Internet Explorer).
- Control + Option + P (Safari).
Once logged in, try to enter the hours on the Weekly Timesheet again and check if the line still vanishes. If it works, go back to your default browser and perform clear cache to remove temporary internet files on your computer. For your reference, you may check out this article for further guidance: How do I clear my browser cache and temporary Internet files?.
Give this a try and let me know how it goes by leaving a comment below. I'd be glad to answer should you have some additional questions. I'm always here to help. Have a good one!