The four innermost planets are probably tidally locked, but Kepler-186f is further out, where the star's tidal effects are much weaker, so there may not have been enough time for its spin to slow down that much.
Low metallicity of the star, at -.26 relative to the Sun or put another way about half that of the Sun,[REF] is associated with a decreased chance of planets overall and giant planets specifically but an increased chance of Earth sized planets in a general study of stars [REF].