Hi! I know that it's a bit too late but I have just experienced the same bug about the overall rating dropping to 64 after editing my player and I found a way to fix it (at least it worked for me).
1. Remove all your skill points
2. Edit your character with a diferent position (I was a striker and changed it to midfielder for example)
3. Accept the changes and do not allocate any skill point for the moment
4. Edit your character again and select the position that you want to change to (I turned back to striker)
5. Accept the changes and now you can reallocate your skill points as you prefer.
My OVR came back from 64 to 90. I think that every time you want to edit your character you need to remove all your skill points because it will reset your stats to your original 64 without counting your skill points.
I am not sure if this would also help with the height and weights.
