Symbol levels not working with Illustrator export

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I use symbol levels to represent different overlaying lines by importance from a field value. The red lines are more important and yellow less. That's what I get in ArcMap:



And now that's what I get after an Illustrator export:



Symbol levels are not respected as yellow and orange lines overlay red lines.

I use ArcMap 10.2 (I don't know if the problem is still in 10.3).

I observed that this problem happens randomly. PDF and EPS exports are not concerned by this issue.

Here are the symbology and symbol levels properties for the layer:





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