NiTi(Fe) has an incommensurate and a commensurate phase between its low-temperature martensitic and high-temperature CsCl-type structures. Anomalous deviations of the satellite positions in the incommensurate phase have been reported. These deviations have raised doubts about the adequacy of a model based on sinusoidal modulations of the basic structure. Our Landau model shows that these features can be explained by considering the coupling of the modulations to the lattice strain.