What's happening to my Madagascar Palm?

I just brought my Madagascar Palms in for the winter after a summer of benign neglect. The largest of them is branching at the top. Where there is generally a centrally arranged grouping of fronds, this one has four groupings. Is this normal? I’ve had this palm for years, and I’ve never seen anything like this.

http://plantsdatabase.com/showpicture/2291/

Like this? Or this?

http://plantsdatabase.com/showpicture/23006/

Seems like branching is rare, but it does occur.

Cillasi,

It’s a bit more like the first one. Thanks for the links.

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