From my knowledge (I'm on a steep learning curve
) Cattleyas dont really obey the seasons, as in, they grow all year, so as long as there is enough warmth and light they will grow like normal and flower when growths are mature.
As for the Dens, I've had some of mine just finishing their flowers now. Its been a mild autumn and quite a mild winter here, and if its the same for you it may upset them abit.
I've heard many others talk of odd flowering times. Its not a major worry, just dont fertilise and we should have flowers as normal in spring