I am having a similar problem with the latest version of Aspose.Cells 7.2.2. I have an excel spreadsheet but when I open the spreadsheet with Aspose.Cells and convert the chart to an image, the legend is wrapping and has incorrect series names. The attached solution reproduces the behaviour I experience.
If I understand correctly, I've seen this problem or something very similar.
With font sizes of 8 in an Excel chart and saving to PDF, the font is written in 12 point. Perhaps they are related issues and can be solved together?
It's not a huge priority for me now because we can resize the charts in Excel to allow for the larger fonts in PDF, but it would be nice if all of the chart properties are carefully validated.
If you still find the issue, please start a separate thread with all the details, sample files (input Excel file containing the charts and output PDF file etc.), sample code etc. We will check your issue and reply in your thread.
I am afraid your issue is still open/under process (we are working over your issue) as I checked the status in our Issue tracking system. Anyways, I have asked the relevant developer to update on your issue. Once we get any update, we will let you know here.