You may perform an action that earns points in 2 activities at the same time (For example, you upgrade a building that gives you Cross-state Battle and Single Player Arms Race points. After the upgrade is completed, the popup notification only shows the Single Player Arms Race points). Please rest assured that the problem is simply that the Single Player Arms Race popup covers the Cross-state Battle popup, causing you to not see the Cross-state Battle points added. The actual increase in score is normal and not affected. You can check your scores in the Activity Center, and you’ll see the correct numbers.
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Game Guide for Last Empire – War Z