Hello Geoff,
I tried to reproduce this, but weren't able to do so. Therefore, this could either be a bug caused by some very specific combination of settings or some error in your code. You could also check our example "Multi-color line chart, event-driven" if not done that already.
Color change when mouse is over a line points to a highlighting issue. The first question is do you need to highlight the line at all. If not, you can disable highlighting via
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lineSeries.Highlight = Highlight.None;
The above alone could solve the issue. Alternatively, you can try disabling user interaction with the line via
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lineSeries.AllowUserInteraction = false;
However, this will also stop all mouse events etc. from working. Use only if you don't need to interact with the line.
If the above doesn't help, we might need more information about the issue. Was this also happening with LightningChart 9.1 version (or whatever version you were using before 10) or was this introduced after you started using version 10?
If possible, you could also sent us a test project to support(at)arction.com, so we could reproduce the issue and also check the code.
Hope this is helpful.
Best regards,
Lasse