In Progress
The spheroid has a representation error in function of the value of the parameters.
For each value of the parameter "a", there is a value of the parameter "c" that interchanges the values of the axis x and of the z axis.
The intersection of the spheroid and the plane are correct.
https://www.geogebra.org/m/hfarv9r2
Juanma.
The same problem 
Thanks for the report. We'll try to fix that as soon as possible.
Cheers,
Mathieu
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