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We examine the statistical properties of polarization maps from Planck 2018within the patch of sky observed by the BICEP2/Keck experiment using the onepoint distribution function (1PDF), skewness, and kurtosis statistics. Ouranalysis is performed for the Q and U Stokes parameters and for thecorresponding E- and B-modes of the CMB signals. We extend our analysis bystudying the correlations between CMB polarization maps and residual maps (thedifference between the full signal and the CMB map) for the frequency range of100--217 GHz with both the Q/U and E/B approaches. Although all the CMB mapsreveal almost Gaussian statistical properties for Q/U and E/B domains, we havedetected very significant anomalies for cross-correlations with residuals at100 GHz at the level of $3.7\sigma$ for the Commander map and $5.2\sigma$ forNILC, for both the Q and U parameters. Using the NILC--Commander difference,which does not contain a cosmological signal, we find a sub-dominantnon-Gaussian component in Q skewness and kurtosis at the level of $4.3\sigma$and $10\sigma$, respectively. For the B-mode we have found a very high level ofcross-correlation (0.63--0.69) between the NILC/Commander maps and the 143 GHztotal signal, which cannot be associated with the cosmological component. Thesestrong deviations suggest that remnants of foregrounds, systematic effects, andcomponent separation exist in the 2018 Planck CMB polarization maps in theBICEP2 sky area, which is far away from the Galactic plane. Our analysis alsodemonstrates the preferability of the Q/U domain over E/B for determination ofthe statistical properties of the derived CMB signals, due to non-locality ofthe transition Q/U $\rightarrow$ E/B.

Comparison of the Planck 2018 CMB polarization maps in the BICEP2/Keck region