Missing information after an import or other unexpected behaviors in QuickBooks Online are sometimes affected by issues in the web browser. Did you log in to a private window, and see if the same thing happens?
If you haven't done that yet, use following keyboard shortcuts to open a private window for different browsers:
Google Chrome: press Ctrl + Shift + N
Mozilla Firefox: press Ctrl + Shift + P
Internet Explorer: press Ctrl + Shift + P
Safari: press Command + Shift + N
If you can see the data there, clear the browser's cache. This method removes the history in the cache to start with a clean slate.