I got fewer rewards for the sector in the Alliance War than expected

The reward amount in sectors may vary depending on the sector's location on the field, the number of Buildings on it, and the Alliance's War level.

For example, at high levels of the Alliance War, sectors located closer to the center of the field are more "expensive" compared to those located on the edges of the Alliance War Map.

Also, sectors where Buildings are located bring additional rewards in addition to War Bonds and Apex.

Choosing which Sectors are more profitable for the Alliance to capture is part of the Alliance War gameplay.

This incentivizes Alliances to not only capture more territory but to also defend it diligently against rival Alliances seeking to encroach on their gains.