"Duplicate names have been found. The duplicate names have been renamed"

I do not understand what this means. The problem is that Origin has lost most of the functions in the process of saving. The function 'layers' (F1, F2 and so on) still reside within the graph but the function definitions themselves are gone. Thus, after the reopening, Origin prints out only one of the functions that were originally in the file. All of the functions printed out nicely *before* I had saved the file. Am I doing something wrong or is Origin just buggy?

If you double-click on the layer icon, in the upper-left hand corner of your graph, to open the Layer Dialog, do you see your functions (F1, F2, etc.) in the Layer Contents. If yes, move them into the Layer Contents. Do they plot correctly?