Troop upgrade - 2 for 1?

I recently upgraded some 2* troops (gold, red, and green) from 0 to level 1 + 140 xp. Oddly, I only upgraded 1 troop in each color, but after the upgrade, I found that a duplicate troop of matching type was also upgraded. I am not sure if 6 x 1* troops were used once or twice, but I certainly payed only one food cost (42K food per upgrade).

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