Yeah knowing how the print is sitting on the bed really narrows down where to look in terms of issues. It could be one of your leadscrews is loose. What happens with that is the setscrews in the upper or lower section of the coupler loosen but not enough that the leadscrew isn’t still turning, just enough that it can slip over the duration of the print. Auto leveling checks the start correctly, but as you go up layers, the left side gets a full turn to go up, the right side only turns 15/16ths of a turn. By the time you get to the top, one side is squished up.
it could also be cooling. if you have one of the two cooling fans fail, you may only be recieveing part cooling on one side of the fillament. The symptom of that would usually be that the inside of the “good” section of the part would be messed up, while the inside section of the “bad” part of the part would match the quality of the good side. Other things could be point heat sources, like a computer sitting next to the bed blowing hot exhaust on one side of the part. it could also be related to lifting. if the heated bed has a partial failure, it could be that its not holding the PLA on one side, and lifting due to contraction. PLA is much, much less prone to that than ABS, but it isn’t out of the realm of the possible.
It could also be model wierdness. It’s unlikely since you are experiancing the issue on multiple parts, but if you want to PM me a link to that section of the cockpit if you don’t want to post it, I can take a look at it and see if it slices odd for some reason.
Another possibility that you shouldn’t be seeing yet is an electrical short in the motor, heater cartridge or thermistor lines. the symptom there are really really really hard to nail down, but what basically happens is that as the print head reaches full X maxiumum, it looses connectivity with the control box and cools down briefly, or looses one of the motor coil pairs and the print head looses force. That issue is usually intermittant, and it happened to me once, and I had a hell of a time trying to figure it out.
It could also be gummed up bearings or other sort of glitch.