Sudden change of tasks in project 5

i have completed my project on jul 20th itself and rejection correction also been done by me. I had spent 1 week for making this presentation, suddenly tasks has been changed. what should i do? This makes me feeling depressed. This wasn't right! please help me with this issue i need to learn more things which learning resources, you can see my attached image which was done by jul 20 . please kindly help me with this . can i resubmit my project as it is? please give me a right response .