First congratulations on getting your moth orchid or phalaenopsis orchid to rebloom. You must be providing it with the correct amount of light and using a good fertilizer like Osmocote. The leaves do look limp and the most common cause is not enough water. I suspect that over the last 18 months your orchid grew more roots but is stuck in the same container. This means the plant needs more water than before as the potting soil fills up with roots and cannot hold onto water.  Do not transplant now but instead  wait until the orchid is done flowering. Then repot it into a slightly larger container being sure to use a growing medium made especially for orchids.  Meanwhile, give your orchid more water especially while it is in bloom. Keep growing, Marianne Binetti