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Maybe packet loss. There is no guarantee that your capture interface sees exactly what the other wireless interfaces observe. Just because they saw it, does not mean you did; just because you see it, does not mean they will.
That adapter looks like a bgn 1x1 (https://wikidevi.com/wiki/ALFA_Network_AWUS036NHA). Make sure the devices communicating are within this capability envelope. If not, you might not see all the traffic between the devices.