I have this giant Peace Lily, Spathiphyllum floribundum, that I bought a couple of months ago. When I bought it, it looked like the first picture - leaves standing up straight. The leaves were dirty and the plant potbound, so I transplanted it into a bigger pot, and cleaned the leaves with a damp rag. Now the leaves started drooping (see 2nd & 3rd pics) but the plant lookes healthy and growing. It lost its flowers since I bought it. I water it really good once a week, it gets no direct sunlight at all but it's in a room that has 8 windows facing north and west. Would anyone know why this plant is drooping and what can I do to help it?