[Psycho]

I've had it too. I was playing a SP game on Pargonas map and was attacking AI from Faldenburgh to Stone Grave Mountains. On the first turn I thought I forgot to move my army. I double checked on the second turn, but they didn't move again. I triple checked on the third turn and it was the very last thing I did before hitting end turn and the army stayed put again. Then on the fourth turn I attacked Rivia instead.

The issue is certainly not connected to the map, because I've played many games on it and never had problems moving between those two provinces before or after. It just happens now and then.