I've attached a test file and I hope someone can clear this up. Instead of trying to explain the issue here and make things quite simple, I've included the steps below.
1- Open test file and towards the right of the layout, you'll notice 6 tracks
2- Click Edit Layout
3- Under Tracks, click to highlight number 1 (RecordNumber)
4- Use the keyboard "left arrow" key and move it once and then the "right arrow" key to move it back
5- Click Exit Layout
End result... Notice numbers 2 to 6 are no longer showing. I've tried, with limited knowledge to have them show again but failed.
Any idea as to why?