Tanks being 1 shot at full HP by IFV ATGMs

This has happened to me twice, but IFVs at a distance, when using the "lock on" ATGMs, can one shot a full HP tank (no reinforced armor) from the direct front. I'm not even sure where the ATGM hit, but as far as I'm aware even shooting the back of the tank with any weapon will not instantly kill a full HP tank. I didn't even get a sound effect right before the ATGM hit I just blew up. I didn't hit any mines, I wasn't hit by anything previously, it was just instant death. This occurred twice on Operation Firestorm. I suppose there might be a glitch that allows for an IFV to fire both missiles at the exact same time, but as I stated previously it seemed like one impact. I was also fully obscured by cover so it had to have hit me on the roof. If this is intended then by all means remove this as a bug report but my team couldn't even get vehicles out of out HQ area without being obliterated by someone we couldn't even see. I sadly do not have it recorded. 

Edit: The ATGM in question is the MR Missile fired by IFVs. I believe they are hitting a very specific area of the tank causing them to do way too much damage. I've seen some videos on the Gunner's MG being a massive weakspot, having more damage dealt than even the rear of the tank. This could be what caused the instant death. (In the video an RPG was dealing 750 damage to the Gunner's MG from the sides and rear, but not the front).