My Stock type plots get reformmated - can I stop this?
 

I have maybe a dozen Stock type plots. I use them for statistics - I plot
how median and 5%/95% percentiles vary over time.

Every time I add a new data point to the graph, the whole blamed thing
defaults to ridiculous settings. Then I have to go in manually to reformat
the X axis location, the color of the median data series, and the up-down
bars.

Is there any way to prevent Excel from changing the graph, or do I just have
to live with this?

TIA