If you are following reasonable guidelines and making good food choices, you aren't doing anything wrong. We all lose at different rate and in slightly different ways. There really isn't a "normal" process. It can vary wildly from person to person. We all want to reach our goals quickly, but I think we should actually try to slow down a bit and focus on building habits and choices that will last a lifetime when we reach our goal weight. If we get there too fast, there is a slightly greater risk that we slip back into old habits. That wouldn't be the case for everyone, of course, there are many reasons that people are either successful or less successful, but I think taking more time to do it while focusing on building good habits might be more beneficial in the long run. I have no real evidence for this line of thinking; it's just a theory.