Adding New Data To Line Chart: New Data Does Not Inherit Previous Color Scheme

This has me very confused. Here's what's being done:

1. Right-click on existing chart
2. Select "Data..."
3. Add additional data in the dialog that pops up
4. Click check-mark

The chart appends more data to the existing lines on the line chart, as it should, however the newly created portion of one of the lines (new data) is not the same color as the line up to that point. The line color is #0084A9, but when the new data is entered the new data on that same line is represented in an ever so slightly darker blue.

Any guesses as to why that would be happening? I can manually chage it, but that's a hassle and shouldn't necessary - I wouldn't think, anyway. Any help would be appreciated.

Thanks!

Very Best,

Tanner Campbell