Change of blooming times?

[maisie]

I have had a Dendrobium kingianum and a Cambria for about five years, which have always both bloomed over winter. They are on a west-facing living room windowsill with bright but not a lot of direct light. There has been no change in the temperatures they get in summer and winter, and no change in the lighting, but this year they started putting out new canes/leaf bulbs straight after they finished flowering around March time. The Dendrobium has even got a keiki coming on one of the older canes, which it's never had before. Are they trying to tell me they're unhappy or need something different? The problem I have is that if I change them to any bigger pots, they won't fit on the windowsill and won't get nearly as much light! Sorry for the essay of a question, I'm just a little bit confused