Hi Kaitlin,
Thank you for the willingness to help.

After watching the video and doing that test, I can be sure it is the ankle that has the limitations. The video got me thinking a bit more and another way I can explain it is that there is a difference between the passive range of motion by use of some sort of external load – And the active range of motion that can be used when trying to access the range of motion without any external load.

Hope that sparks and idea from someone on what it could be. Thanks.