Lots of horses have a high heel/clubby foot on one side, and a long toe/sling under heel on the other…
The second picture is why. If Ducky always grazed in this stance, he would likely get a slightly clubby left front. Thankfully, he stands ALL the ways, as you can see in the first picture.
Foals are dramatic because their legs are so long and necks are so short! But many tall adult horses have this same conundrum.
We keep an eye on all our horses of every age and trim appropriately as needed to help prevent asymmetric issues. Correct riding and groundwork also helps to keep the horse even.
Other postures matter too- I had a student whose horse twisted his neck so badly traveling left. Finally realized he had a hay feeder in his stall and the way he stood at it he had his head twisted, nose left, ears right, the WHOLE time while eating!!!!
Btw- maybe check your own posture too…. How you sit on your car, which side you sleep on, which hip you drop while standing- it all has a huge effect on your body!!