Pathfinder 2nd – Focus Pool for Druid Storm (PF2e) – 4 focus points?

A Storm druid (from PathFinder 2e) initially has 2 PF (focus points) + 1 FP of WIND CALLER feat + 1 FP of INVOKE DISASTER feat = 4? However, the overall limit is not greater than 3 PF. Thus, +1 FP of INVOKE DISASTER is impossible. Why is the increase in FP done in this feat?