Hello maddieebrown,
It sounds like your group message is stating the photo was changed, but no change was made, correct? We'd like to look into this.
Just to confirm, it sounds like this is only happening with a specific group message, correct?
If the issue is only happening with a specific group message, can you let us know if there were any other changes made to the group previously? For example, was the group name recently changed? More about that here: Name a group text message on your iPhone, iPad, or iPod touch
Are other people in the group seeing the notice that the group photo was changed, or does it only show on your device?
Also, to help narrow this down further, can you confirm which iOS version your device is running? Find the software version on your iPhone, iPad, or iPod
Thanks!