Hey Filipe,
Thanks for the bug report! Seeing this on my side too and I’m fairly certain it is coming from a delay in when we adjust the capsule size/visual component and when we teleport the capsule to account for the different sizing (since teleporting the character gets queued with an instant effect). I went ahead and made a ticket for it and will be looking into a fix! If you need a workaround, doing all of the adjustments (capsule size, visual component offset, and capsule location) at the same time in a new instant effect that gets queued from the stance modifier should fix this.
Thanks,
Nate