Most likely what's happening is that they're moved off of the screen. If you save your layout, you should be able to edit the file and change the location coordinates to other places; I'd go for locations that should be easily seen given other coordinates you have for working stats. Then you can always move them around as needed.
If that doesn't work, or you have trouble doing it, please export your layout and attach it to a
support ticket and we'll look into it further.