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Normal or not depends on the real configuration. If you get the device-under-test close to each sniffer device, does it register? If so, the configuration and capability is likely OK. However, you just may not have the receive capability on the wireless adapters to pick up devices that are far away. Far is a relative term - you should be able to experiment and see far you get and still be able to pick up the probes. interference could be an issue as well - depends on how clean your environment is. Different physical wifi adapters will have different capabilities. One of those really small USB ones might look great, but nothing is free: the antenna is terrible. Packet loss is the single biggest issue in the wifi environment, so it has to be managed.
Something like this with an external antenna might do best:
https://wikidevi.com/wiki/TP-LINK_TL-WN722N
