Good advice. Likely it's poopipe's solution. FFD has trouble with flat models sometimes, where the volume is generated with the actual vertices outside and thus unaffected.
Went more in depth and found the cause of it. Basically i have a 6x6 grid on my plane and i cut and move the vertices to shape around my image on that plane, and its when i move atleast just 1 vertex that the FFD Modifier won't work afterwards, i tried putting the FFD Modifier on before/after adjustments to see if that…