Not received reward event items

I completed the blast from the past reward event and while I was doing the second half of week 3 and all of week 4 my progress wasn't updating. After I finished, my game crashed (could've been unrelated, but I'm not sure, my game almost never crashes) and now it's showing I haven't completed any of week 3 and 4 and it doesn't give me the option to do them at all. However, I still have the rewards from the first half of week 3.