Foot/ankle "turns" when I put weight in my heels
OK, so I'm hoping someone here can give me some advice, because I haven't quite managed to figure this out yet. I hope my description will make sense.
When I put weight in my heels, my feet, especially the left one, tend to rotate out a bit so that the foot is kind of resting on its outside and my ankle is bent in. The balls of my feet are barely touching the stirrup at the big toe, and this is more true when I try to have my toes turned in a bit more (which I do try to do from the hip, not just the foot). Imagine if you were standing on the outside of your foot -- that kind of position.
This can get really uncomfortable for my ankle pretty fast, and I feel like it's not very secure and probably asking for injury to ride around with the ankle joint bent like that.
If I lower the stirrups a bit, it doesn't happen but then they're a little too low for me. I think a half hole lower would work, but they're not my leathers so I can't do that (I could buy leathers if this is really the problem).
I did just start riding recently so it could be a flexibility issue as well but I'm not sure what to do to work on it. Any thoughts? Thanks!