It's been happening in the recent games i've been playing. But when players have reserves, and attack and lose there army is down to 1. But at the end of there turn. They were able to fill there standing army, and still have the same amount of reserves.
In the last game I played, me and another player both had 7 reserves. He decided to attack my 8, and he lost. So we both had 1 and 1. But at the end of his turn he had 7 on the field and 6 in his reserves. Wtf?