I don't know, but let's rule out that the problem is data related. Create the graph by using the data from last week or month. Presumably the graph will still be broken.
If so, then something changed on your system? Fonts, maybe? Or an ODS style? Get rid of the FONT= option on the TITLE and FOOTNOTE statements. Does the problem still occur? If so, change to a different ODS style and rerun.
Let us know what you discover.
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