I have today play with my Women and found this bug.
I have start the game with 500 gold. The Gold that you see is 365+45+45+45=500 Gold, well i have make Archer Elephant.
when you now train the units like this
an delete the Archer Elephant you become +125 Gold for free
This is free Gold when you will. I dont know this work with another Units but with Archers Elephant it work.
You loose with this Food and Wood and you win Gold
Sry for my bad English.
Please FIX THIS and please make for the next update a BETA
Edit: Its works with all Gold Units, you need at first 2x no gold unit and than 2x Gold Unit and 2x no gold units, than delete the Gold unit and you become free Gold and loose food or wood