In that case I don't know what could have happened. It is not normal for them to do this. But I'll also say that the ice show they present (while good) is just a variation on the same format they've used since the concept started on the Voyager 12 years ago. If you've seen an ice show on RCI before you will find the one on Allure to be quite familiar.
In other words, if I had to set a priority between conflicting shows I'd drop the ice show first. Just my personal choice.