The primordial deuterium abundance measurements, obtained from absorption systems in quasar spectra across different redshifts and cosmic locations, exhibit unexplained scatter and apparent variation that cannot be easily reconciled with the expectation of a uniform primordial deuterium abundance from a single, isotropic Big Bang Nucleosynthesis event in Lambda-CDM. The scatter appears both as statistical dispersion in measured values and as potential evolution or anisotropy with redshift and direction, suggesting either systematic observational errors, non-standard nucleosynthesis physics, or genuine cosmic variation in primordial conditions (Cooke et al. 2014; Pettini & Conan Doyle 2000).