Herschel,
Thank you for the information. While I was waiting for your reply, to try and reproduce the reported problem, I played the Dash for Dvina scenario 4 times in a row this evening. However, I did not see the AT-guns firing at a range of four hexes at any time during those four games. I deliberately placed my units at a range of four hexes from all the Russian AT-guns, in clear LOS, several times each game. The guns did not fire from that range in any of the four games played that I observed. Apologies, but I was unable to reproduce the problem.
Is it possible that you saw the Katyusha mobile artillery unit in the same area of the map firing over the AT-gun on the hill? That was the only thing I could come up with after playing tonight.
Here is a question for you as a player. Would it help if the enemy units showed the same red target arrows that friendly units show when they are targeting? It would be easier to identify which enemy units are firing in that case.
Trent