Was there a problem with nuclear missiles not working?

I am playing an older version of the patch (from the fall) since that is when I started my current game and I have a weird bug where the nuclear missile doesn't work when used against a foreign land:

1. If I use the missile on enemy land, it flies weird, always standing upright and, even if there is an explosion, it does not do any damage to either units, cities, or terrain.

2. If I nuke my own land, even encompassing enemy lands, the missile flies correctly (nose pointing towards where it is going), explodes properly and does damage to everything. If I detonate it in my territory on the border, it also damages enemy lands and everything properly.

3. Nuclear missiles also work just fine on neutral and allied lands.

But I try to nuke someone I am actually at war with... and NOOOO, even with the explosion there is no actual damage. Plus that whole missile flies upright thing...

Any of you guys ever encounter something like this?

 

I think there is a building giving 50% chances of nuclear strike to not work.
And that there is a "bug" (maybe unfixable) making the explosion animation still play even if the nuclear strike do not work.

I rarely play up to end game, so I'm not sure of how it works.

 

The

The nuclear bunker?