
Some plants predict what season it based on external factors. Light/humidity/rainfall (or watering in your case) are some tells. If you’re using natural light on it, then it’s possible that your orchid knows that it’s winter just from the shorter spouts of daylight, and knows to not waste energy on producing flowers. So it’s probably not your fault, might just be the plant following its own rhythm.
If it’s producing more leaves, then I think it’s due to a lack of sunlight. Maybe get a special lamp to make up for the shorter daylight hours during the winter? Don’t overdo it, you don’t want to scorch your leaves, but maybe a couple extra hours in the evening with the lamp may do it.