The orbital strike on Hoth worked fine until patch 1.1, at which point something changed, and the ATAT controls have all gone to heck since then. When they enabled the orbital strike on the Endor ATAT, everything went glitchy there, too. It's weird, the orbital strike can work fine one game, and be all wonky the next. Or go well for the first 2-3 strikes, then fail on the 4th. Part of the problem is that they tried to change the radius in which the ATAT could strike, but now it is inconsistent, and you have to make a totally wild guess as to where you might be able to call in the strike. It is even more of a wild guess when the "target" is missing, and you have very little idea what is going to happen and are just striking blindly. There have been multiple reports on this problem ever since patch 1.1. It is one of the big complaints when you read comments on people's vids and stuff elsewhere on the internet. It is so frustrating, because the ATAT worked great in BF1, so it is very disappointing to long-term BF players that the ATAT is so freakishly buggy.
