Export png showing extra traces

[welbournR]

The reflectivity/SLD profile .png produced on export in webview contains extra traces not associated with that model. I suspect it is doing some sort of add on top rather than starting from a clear figure but not completely sure.
For example this should be 2 contrasts, one per model (ACMW and D2O), but they also show other traces that I think might be from prior fits. If I look at ones saved later they have even more on them. SLD profile is probably clearest place to see.

[bmaranville]

I think we're going to tackle the refactor of "export" after the 1.0 release, but if I can see what's causing this I'll fix it sooner than that!