... due to lag...
I was removing army to be built from my barracks, clicking on X.
Suddenly i pressed "instant complete" for my elite soldiers (ouch), costing 100gems. Instantly, no ask again, no nothing. 100gems one click away, that simple.
The funny thing, is that i was using an 3x buff on my barracks at that time.
Please fix this instant complete thing. Put a further question like "ARE YOU SURE" ?