I believe your issue is that you never provide any actual work/duration. You have an actual start. When you enter remaining duration Project takes that duration from the Stop date, which is currently the same as the start date and assigns the task 3 days. I believe what you are wanting to do is to extend the duration, enter an actual duration, and then remaining duration. Note the status date doesn’t come into play when you are managing tasks unless you set appropriate settings. Hope that helps. You are doing a lot with this task and need to tell Project what you want each step of the way.