I drained the pool below the return, added the winter chemicals, put in the air pillow and put the cover on the pool. I then started adding water on the cover. I cannot get water all the way around the cover. Water will only make a puddle about 1/2 way around the pool. I am at a loss. Is this normal or am I doing something wrong? It is a 27ft. round pool. This is the first year of owning the pool and my first closing. Any advise would be appreciated. Thanks in advance.