Metroplex and Fort/Grand Max's crotches...

So after I put Gen. Metroplex and LG Grand Max side by side I noticed that the latter's crotch is backwards compared to the other. I don't own a TR/LG Fort Max but my friend confirmed the same for his Fort Max. Is it a misassembly or are the crotches meant to be reversed for the Max bros? Anyone tried putting the crotches the other way, and does it affect transformation?