Please delete your Yahoo! league from League Dominator and then re-import it.
If this doesn't resolve the issue, please follow these directions to remove your instance of Yahoo! from your online League Dominator:
1. Hover over the shield
2. Click Edit & Sync My Leagues
3. Click the Red X to the right of Yahoo! (this will remove the Yahoo! instance)
4. Click the green Add button in the upper right to add your league