I think this started happening after the recent weekend interruption of FRED service, three or four weeks ago.
I put a few different measures of debt on one graph, and everything was fine. Then I decided to show them all as annual data and index them all to 1951.
The problems that resulted may be because of a mismatch: The Federal debt is aggregated for "End of Fiscal Year" and the others are "End of Period".
Here's what I got:
1. The "Edit Line 2" window says the data is indexed to 1951. But the title line of the graph says it is indexed to 1950.
2. The sequence of the title lines (with Line 1 down at the bottom) is not my doing.
3. I was working on Line 1 when I set the units to Indexing, set the Date, and clicked the "Copy to All" button. Pretty sure, Line 1. When the screen regenerated, three of the lines were momentarily very low and one of them (Finance, probably) went high. That's more or less what I expected. But before I had a chance to look at the resulting graph, it regenerated again and came out as shown here.
4. Note that even though the "Edit Line" windows show that all four of the series are indexed to 1951, the Vertical Axis Label says that at least one of the series is given in "Billions of Dollars"
Flukey, flukey thing.
//
Yup. Okay, I got the "page short URL" link and displayed that. The one line is high on the graph and the others all low, as expected. The Vertical Axis Label says only "Index" as it should. The four lines of the title are back in the correct sequence. All as should be.
But the Federal Debt title line still says it is indexed on 1950, and the Edit Line 2 page still says 1951. Come to think of it, that's probably right.