I am having the same issue with entering vendor bills. The first expense line is not displayed on the screen. My first fix was to save it, then reopen the bill. Then the expense line was displayed and I could adjust from there. I discovered that a better work around was to click on the items tab and then click back to the expense tab and the line is now displayed. This bug is also showing up when entering credit card expenses. Running the software update does not seem to fix this problem, so until QB fixes it, we need a work around. BTW I am running QuickBooks desktop 2021.