I have run into this WISP issue:
I want to connect to a network which has 2 APs: The first on channel 13 has a strong signal, the second on channel 11 has a weak signal.
The mini router however is set to country US, so instead of connection to the strong signal signal on channel 13 it connects to the weak signal on channel 11.
This can be corrected in LUCI, but the GLI WISP manager probably overrides it.
In countries different from the US this can occur.