I bought these 101 F4 Classics not too long ago, but sadly the left one has morphed into a sad shell of its former self. The rest of the wheels look like the one on the right.
I really liked the classics, so it's a bummer. The set of 99 Conical Fulls I had before didn't shapeshift like this one. I've since put the conicals back on my current setup since I saved them, and have taken all the classics off.
Can you take another pic of all four lined up?
I would almost guarantee from biggest to smallest, they would be front heel, front toe (maybe coned), back heel and then back toe (also coned) and I would think that from the wear, you ride the graphic in?
I could be wrong, but I have seen way too many sets like this over the years, all from not rotating wheels and lots of solid skating. I even have a few sets I have kept, because they have been unreadable with the front heel almost untouched same size as new and the back down to bearing covers. Front toe will cone the most if you carve into things, or both toe side wheels will cone more so than heel side which wear down flat or even reverse coned.
Rotating wheels makes them wear more evenly and last a lot longer, usually swap the diagonals, eg front toe for back heel keeping them the same way facing out, but if you do notice significant wear on one wheel, swap it with the biggest of the set so at least those two get even wear.