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.


Like this? Or this?


Seems like branching is rare, but it does occur.


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