  For rotation powered pulsars, the rate of change of the spin period is
expected to be positive. On the other hand, for a clean binary system (where
gravity is the only force acting on the pulsar) the rate of change of the
orbital period is expected to be negative. There are, however, some pulsars
with the measurements of the rate of change of the spin period as negative
quantities. Likewise, there are some pulsars with positive measurements of the
rate of change of the orbital period. We investigate these cases by eliminating
the external dynamical effects. We also look at those cases where at first, the
measured values possess the correct sign, but on subtracting the dynamical
effects, the sign changes. We use `GalDynPsr' package to perform these tasks.
Moreover, we investigate possible reasons for such anomalies.
