SSID interface showing some error

Hi Guys,

I have been working on an Access Point and the SSID interfaces (ath0 and ath1) are showing some kind of error, i am mentioning below the same

Bit Rate:1.201 Gb/s Tx-Power=24 dBm **
** RTS thr:off Fragment thr:off

** Encryption key:F1A8-2AF3-55CD-AC5B-CC2B-D234-6117-DD17 Security mode:restricted**
** Power Management:off**
** Link Quality=0/94 Signal level=-71 dBm Noise level=-71 dBm (BDF averaged NF value in dBm)**
** Rx invalid nwid:32505 Rx invalid crypt:0 Rx invalid frag:0**
** Tx excessive retries:0 Invalid misc:0 Missed beacon:0**

As you can see RX invalid shows nwid, can someone explain what is that? Also link quality shows 0/94 why is that, what could be the reason?