  In this work, we investigate whether the baryon acoustic oscillation (BAO)
measurements from redshift surveys, like the Sloan Digital Sky Survey (SDSS),
and the Dark Energy Spectroscopic Instrument (DESI), are consistent with each
other. We do so by obtaining the Hubble and deceleration parameter,
respectively $H(z)$ and $q(z)$, from both datasets using a non-parametric
reconstruction, so that our results do not depend on any {\it a priori}
assumptions about the underlying cosmological model. We find that the
reconstructed $H(z)$ and $q(z)$ from SDSS are significantly inconsistent with
those obtained from DESI, and that both are only marginally consistent with the
$\Lambda$CDM model ($\sim 3\sigma$ confidence level). Interestingly, the
combined SDSS and DESI dataset reconciles with the standard model. These
results are mostly unchanged with respect to different assumptions on the sound
horizon scale value, as well as different reconstruction kernels. We also
verify the results for the null diagnostic $\mathcal{O}_{\rm m}(z)$, finding
that SDSS favours a quintessence-like dark energy model, whereas a phantom-like
dark energy is preferred by DESI data, and once again the combined dataset
strongly agrees with $\Lambda$CDM. Therefore, our results call the attention
for further examination of such inconsistency, as they can lead to biased and
divergent results regarding the validity of the standard model, or the
suggestion of new physics.
