"bought 2k from each category."
Your army can only have 3,000 units, sounds like you bought 8,000....so only the highest 3,000 count towards your stats. The rest were wasted buys.
we have a winner!! i think smbass above is correct you over bought and though they list as in army not all might be being used.
the game is set for 3,000 but has to use more when other things come into play like during pvp so u might see a difference if u atk someone or if u can get an attacker to send u a screen cap to see what they saw.
but other wise until gree change the game again if they do... then u bought more than the set army uses in the game.
you could always recycle the excess and use the $2.74 towards buying a supply depot.
Modern War
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So then just buy up to 3k of the new units?