Inaccurate proportions? Shoddy designs? Must be the workings of a bootleg.
For your viewing pleasure, here's the box art for a bootleg Vietnamese version of Ruby Spear's Mega Man cartoon. The VHS is said to be quite common among local flea markets, retailing for the equivalent of two dollars.
Proto Man looks great, (though his appearance in the top left is questionable) but what is up with Mega? Definitely a (crappy) tracing job, the basis of which, seen here. A for effort!