Pepper problem

I have five bell pepper plants and one jalapeno plant that made it through the winter inside. Recently I downsized three of the plants from five gallon buckets to three. The buckets were too big for the plants and the smaller buckets provide more room and better movement. The problem i'm experiencing is the leaves have begun to curl upwards. I recently started watering them with rain water collected in a bucket and I'm wondering if there may have been something in the water to cause them to turn upwards. I also fertilized them when i moved them. Just wondering if anyone knows what the upwards curl might mean.