Too many research points

I have started playing campaigns and after five missions in WoL a noticed that I have too much zerg research points. I have completed Mar Sara missions (no research points), The Evacuation (3 zerg research points), and Smash and Grab (4 protoss research points). After Smash and Grab, the Lab was unlocked with 4 protoss and 6 zerg research points. Are that additional three zerg points some sort of a hidden bonus ot just a bug? Is any way how to correct it?


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I always figured it was 1 zerg point per mission first 3 missions. Thats my logic to it.