How often are you working on the plantar fasciitis?
Are you seeing improvements with it?

Things can originate on the side of the calf with the soleus.
Smashing the outside of your calf and along the outside of your lower leg.

A couple others to check out:
Does your big toe extend?
If not, it restricts range of motion and tightens your fascia and it doesn’t recoil effectively.

Are you glutes engaged?
If not, foot contact time with the ground is changed.

Weak psoas?
In this case you claw the ground when walking. This irritates the fascia.