Help Enemy mechs in the forward fire arc are hitting rear armor

[Drifter]

I have a game going and the enemy bot controlled mechs are hitting rear armor from forward arcs.  The pilots have no advantages that would allow this to happen, so either a funky rule has been activated some how or the computer was cheating

Red arrow on Hex 311 pointing at the javlin at 210 was how the mech was facing

[Drifter]

Weapons fire for Panther PNT-9R (Draconis Combine)
    PPC at Hunchback HBK-4G (My Campaign);  needs 6, rolls 6 : hits  (using Right Side table) LTR
        Hunchback HBK-4G (My Campaign) takes 10 damage to LTR.
            Armor destroyed.
             6 Internal Structure remaining.
            Critical hit on LT. Roll is 10; 2 locations.
            CRITICAL HIT on AC/20 Ammo (0).
            CRITICAL HIT on AC/20 Ammo (5).
            *** AC/20 Ammo EXPLODES!  100 DAMAGE! ***
        Pilot of Hunchback HBK-4G (My Campaign) "Nathan Fick" takes 2 damage (2 total hits).
        Pilot of Hunchback HBK-4G (My Campaign) "Nathan Fick" needs a 3 to stay conscious.  Rolls 3 : successful!
        Pilot of Hunchback HBK-4G (My Campaign) "Nathan Fick" needs a 5 to stay conscious.  Rolls 2 : blacks out.

                >Hunchback HBK-4G (My Campaign) suffers catastrophic damage, but the autoeject system was engaged.
            
Hunchback HBK-4G (My Campaign) must make a piloting skill check (landing in light woods).
            Needs 10 [4 (ejecting) + 3 (pilot unconscious) + 1 (automatic ejection) + 2 (landing in light woods)], rolls 9 : fails.

                    The pilot ejects safely!
        *** Hunchback HBK-4G (My Campaign) DESTROYED by ejection! ***
                Hunchback HBK-4G (My Campaign) takes 100 damage to LT.
                     SECTION DESTROYED.
        LIMB BLOWN OFF Left Arm blown off.
                94 damage transfers to CT.
                    Critical hit on LT.         Roll is 4;         no effect.
                Hunchback HBK-4G (My Campaign) takes 94 damage to CT.
                     SECTION DESTROYED.

                    Critical hit on CT.         Roll is 6;         no effect.

[Drifter]

I included a pick of the pilot to show he was a 4/4 with no advantages to explain how this happened

[Kerfuffin(925)]

If you look at the arrow in front of the mech being shot you’ll see that is the way it’s facing.
You Torso twisted it, which makes it look like the facing has changed.

[Drifter]

he was torso twisted towards the panther and was able to fie their ac20 at it

[Hammer]

Sounds like you have Advanced Hit Locations optional rules from Tac Ops turned on.

[Simon Landmine]

... or the computer was cheating

The computer applies exactly the same hit location rules as apply to human players. Unlike some other games, the computer is not programmed to have a built-in advantage.

he was torso twisted towards the panther and was able to fie their ac20 at it

Torso-twist does not affect facing for the point of view of hit locations (TW, p.119) - the arcs for hit locations are based on the direction the 'mech's feet are pointing, not the direction the torso is facing.
If that's not the situation, then, as Hammer suggests, check whether you've got the Advanced Hit Locations option switched on.

[Drifter]

Thanks it was the advance hit locations in tac ops