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The first solar proton event of solar cycle 25 (SC25) was detected on 28 October 2021 byseveral neutron monitors (NMs), specifically located in polar region. The strongest signal wasregistered by high-altitude polar NMs at Concordia French-Italian research station, namelyDOMC and DOMB, standard and bare NM, respectively. Several polar station registeredstatistically significant NM count rate increases allowing us to study the event, namely to derivethe spectra, angular distribution and apparent source position. Here, we report the resultsobtained by two different teams and discuss the observed differences.