Hi @Mr S. Smith
Based on our research, there are a few possible solutions that you can try:
- Check and update if the Teams is the latest version.
- Clear the Teams cache from your device.
- If you’re using the Teams desktop or mobile app, try using the web version: https://teams.microsoft.com/.
- Export the grades to Excel and use formulas to calculate the averages.
Otherwise, New Teams currently has a few features that aren't perfect, and as an alternative solution you can switch back to old Teams if you need to. Hope the above information is helpful for you!
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.