GEORGE

Hi, I'm new here. I have only had my puffier for a couple months. When I received the plant the "bulb" looked very healthy. But as time goes on I have noticed the "bulb" looks as though it is getting smaller as though it's drying out. It's in a window with blinds facing South. I water when I feel the "soil" drying. Leaves seem fine. I guess my main question is why is the "bulb" appear to be drying and getting smaller?