Mikrotik beside Dragino and different traffic

step learning curve, thanks for taking time to read and comment:
I am making the setup on different gateways.
By chance I had a Mikrotik LtAP LR8 LTE kit beside a DLOS8,
each with same antenna type laying on the table 10 cm apart. ( in cellar underground, btw)
the dev with 26:xx:xx:xx I know they are mine sensors.
however how could be that I get a lot of traffic from devices I never seen only on one gateway and not see them in the other? different radio setting? (which one???)

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A quick answer will be that both gateways have different performance. This can be due to different designs, a defect, a difference in antenna circuit, etc. Also having 2 antennas at a distance of 10 cm will not ensure the same performance.