为什么这个melis里面的Wi-Fi不同指令结果不一样啊？

[leomini5]

这里面不同的指令输出的RSSI都不太一样是为啥啊？

msh />wifi -s
wifi -s
 0 bssid: 78:D2:94:B6:8E:16   ssid:leo                      ch: 4    rssi: -29   key_mgmt:  3
 1 bssid: 74:D0:2B:7F:1C:BD   ssid:leo                      ch: 4    rssi: -43   key_mgmt:  3
 2 bssid: 7C:94:2A:4E:E1:80   ssid:Yaru                     ch: 1    rssi: -62   key_mgmt:  3
 3 bssid: 62:EA:8D:F5:23:28   ssid:Taobao                   ch: 11   rssi: -59   key_mgmt:  3
 4 bssid: 2A:E5:B0:1B:AC:C0   ssid:ChinaNet-EpXw            ch: 1    rssi: -62   key_mgmt:  3
 5 bssid: F4:6A:92:C1:19:38   ssid:zhang789                 ch: 1    rssi: -62   key_mgmt:  3
 6 bssid: C8:BF:4C:ED:70:D3   ssid:SJC24_2.4G               ch: 1    rssi: -72   key_mgmt:  3
msh />xradio wlan get_cur_signal
xradio wlan get_cur_signal
[cmd] net cmd: wlan get_cur_signal
current rssi:120, noise:-89
msh />