Strange behaviour when working with clusters

[weidenfreak]

Hi,

I think I encountered a bug in the cluster algorithm. I have a grid like the one shown in the screenshot below:

When I plot a normal bertin everything is fine. But if a want to draw a clustered version (either with cluster or bertinCluster) one of the constructs ("trustworthy - mysterious") (no kidding...) disappears and instead the construct "passive - interactive" appears twice but one time in a converted form.

If I remove the "passive - interactive" construct then the "trustworthy - mysterious" appears again and everything works as expected.

Here's a gist with the file I'm using: https://gist.github.com/weidenfreak/5b2f3c7f7fb599d4ec6c