Welcome to this forum Jalidi, your question is a little like asking, "Why is my car using more petrol." Like a car we need to know a lot more, Computer Model, Year, Operating System and version of iPhoto.
How many iPhoto libraries do you have? Have you attempted to move or copy your iPhoto Library?
If you provide us with more info we can try to help. The info you have given us does not even get us to first base.