Glorious Victory! Followed by a strategic withdrawal

[dojango]

So, it was the battle of battles. The showdown between good and also good (but followers of a different belief system). I ordered our glorious army to march into the chokepoint between the two empires where we would meet on the field of battle.

When the turn report came up the next turn, it was a defeat! A pyrric victory for the worthy foe, but a defeat nonetheless. So I watched the battle to see what went wrong...

Without going into too much detail, our army put the enemy to flight! The enemy's fleeing troops were cut down, no mercy asked for nor given. It looked like a great victory for me and the one true god! But nonetheless, on the strategic map, my armies were scattered and the enemy remained in control of the province.

What happened? Was the battle that the server resolved different from the one that was sent to me? Is this a common bug? Just wondering.