Hi Allison
It could be your shoes or flip flops. It could have something to do with the way you use your feet in and or out of yoga class. Have you seen my video:
Great Posture From The Ground Up? There could be some answers in there for you.
Let me know if this is still happening. I realise it was a while ago that you posted.
Hi Angel
My thoughts about Triangle. You mention that your toes go numb in triangle. So I figure that you are putting too much weight on them in that pose. Drive the weight down through your HEELS. Lift your toes to activate your feet, press the balls of your feet down. If your feet are sliding and toes are pressing down then that is a fundamental problem you can fix.
If what I said doesn’t work, we can work back through another fundamental you could address!
Namaste
Gabrielle 🙂