A bit difficult with only a bit of the trim sheet to work with. If you post the whole trim sheet I can give you the answer. At present we don't have enough information to figure any sums.
With what you have given us, the numbers along the bottom should be the background moment or IU vertical scale to which any trim sheet is drawn. If you follow them right up to the top line where you start the IU calculations, you probably will find that the top and bottom scale line numbers are the same.
Perhaps you can post the whole sheet and we can resolve the problem very easily. (FWIW, over the past 60 years I have designed probably 400-500 trim sheets)