You either moved UP/DOWN to the next Tier Map grouping (ie, Intermediate to Hard, etc).
And your alliance is NOT setup to automatically transfer over your defenders onto the next (+/- Tier) of Map onto the same nodes.
(*which is fine, so long as your members always remember to place their defense MANUALLY into the +/- potential Tiers, as well as placing into “Current” Tier defense map. When they first are superintendent up their defense).
Comments
And your alliance is NOT setup to automatically transfer over your defenders onto the next (+/- Tier) of Map onto the same nodes.
(*which is fine, so long as your members always remember to place their defense MANUALLY into the +/- potential Tiers, as well as placing into “Current” Tier defense map. When they first are superintendent up their defense).