Completed rides being marked as Expired in training plan

Hi, I am signed up for the “Build me up” cycling training plan on Zwift. Everything has gone fine apart from when I got to week 10, when rides from the plan that I have completed and saved (confirmed since they are in my Zwift activity and saved across to Strava) are not being marked as completed in the training plan, and are eventually marked as Expired. Any help appreciated, not a big thing (I am managing to complete the plan) but just very frustrating. Thanks!