Your sessions are listed in chronological order on Decathlon Coach. The date of the session depends on the date your watch is set to. Check that your watch has been set to the right time. If this is not the case, your session will be listed according to the date on your watch. You will have to search in your Decathlon Coach account log and modify the date manually by clicking on the "pencil" icon.
Learn how to view your sessions by watching this instructional video: