got a duck/chicken waterer and a food thing from the feed store that you use a quart jar for. have a question. is the waterer suppose to self fill up when they drink so much or you suppose to lean it sideways when empty. mine i have to lean it to get water in the little tray for their water, it will not self fill up when they drink the water. i found it bone dry and the jar was completely filled but no water in the bottom. anybody know the trick for it to like it is suppose to ???