Hi Fabien, maybe the AutoCAD LT spline to polyline conversion mechanism is sensitive to things like the parameterization of the spline.
It looks like there is a command in AutoCAD for converting a spline to a polyline, see here:
https://knowledge.autodesk.com/support/autocad/learn-explore/caas/sfdcarticles/sfdcarticles/How-to-convert-splines-to-polylines-in-AutoCAD.html
If that's available in LT could you try using it on your original imported spline and see if you can repeat the odd behavior? If so that would probably pinpoint the problem being AutoCAD's conversion mechanism.
A couple of possible solutions:
Try using Edit > Separate on your curves in MoI before exporting them to AutoCAD. That way AutoCAD will treat each one as an individual object and that might avoid the problem if it's the AutoCAD uses some kind of parameter space tolerance for the conversion which could make it think the arc is small if it has a small parameter space compared to the other segments.
The other thing is you could export from MoI using polylines at that point rather than relying on AutoCAD to do the polyline conversion.
Please let me know if those don't help.
- Michael
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