Camera Rendering Too Soon?

I recently starting seeing a weird bug. When my scene loads, the very first frame shows a lot of objects out of place, even though their positions and/or animations are setup in Start().

For example, my character's animation is set to play on Start(), but in the first frame after the scene loads, he is still in a T-Pose. Other objects whose transform.positions are set in Start are not in place yet. Does anyone know why I'm seeing this, and possibly how I can avoid it?

Thank you!