All of these descriptions make it sound either fundamentally flawed to the max as a squared up position or anatomically awkward as ****. How does he teach you to pivot into your punches if your weight is distributed that way? I think a video of you moving in stance would help everyone quite a bit.
This still doesn't make sense man. Here is a picture of a dude in an orthodox stance. This content is protected Left foot in front, left hand in front, body turned towards the right. Here is one in a southpaw stance. This content is protected Right foot in front, right hand in front, body turned towards the left. What do your hands look like? What do your feet look like? Of course, there are variations to these stances, Hand position, feet width, posture etc, but for the most part, your body is always going to line up evenly, meaning, your waist is not going to be twisted (The way it would be if we crossed the styles the way you seem to be describing).
Lol. I feel ya man. I'm kinda enjoying this, it's like trying solve a riddle. You said you move your left foot first and you said your feet and hips are in southpaw stance so that would be your back foot. I think the confusion might be in your usage of the term 'stance'. Stance to me is the formation you shape up in and move around the ring etc. If you're talking about the position your body is during the process of a particular combination I wouldn't really refer to this as stance. So are you perhaps talking about this situation: You shape up and move around in a standard orthodox stance and in the process of throwing a 1-2 for example you lead in with a normal jab (I.e left foot stepping forward) and then when you follow with the right hand you cross your right foot over with the punch with it ending up in front of the left foot. And then you correct your footing into the standard orthodox stance again? If this is what you're taliking about then, yes, it is unorthodox because it breaks one of the fundamental rules of crossing your legs over (like waliking forward). But it isn't that uncommon, guys like Pac and RJJ for example do this Effectively sometimes. If that is not what you're talking about then I give up and yes it is wrong. There is no value teaching someone to naturally punch incorrectly. There's no time to think in boxing so you need to rely on what you've conditioned yourself to do by repetition in training.