Authentication Response with Incorrect Authenticator

The following is an error log for RADIUS Authentication Response with incorrect authenticator.

[radius-ep-n0-0] ************* TRANSACTION: 00044 ************* 
[radius-ep-n0-0] TRANSACTION SUCCESS: 
[radius-ep-n0-0]     Txn Type             : RadiusUdpProxyMsg(2002) 
[radius-ep-n0-0]     Priority             : 1 
[radius-ep-n0-0]     Session State        : No_Session 
[radius-ep-n0-0] LOG MESSAGES: 
[radius-ep-n0-0]     2020/12/09 13:20:38.874 [TRACE] [infra.message_log.core] >>>>>>>> 
[radius-ep-n0-0]  
[radius-ep-n0-0]     2020/12/09 13:20:38.874 [DEBUG] [Radius.smf.AAA] Response received from udp proxy 
[radius-ep-n0-0]     2020/12/09 13:20:38.874 [DEBUG] [Radius.smf.AAA] SrcIp: 209.165.201.20 SrcPort: 1812 DestIp: 209.165.201.4 DestPort: 16384 
[radius-ep-n0-0]     2020/12/09 13:20:38.874 [ERROR] [Radius.smf.AAA] PID: 4194310 - Packet dropped due to invalid authenticator 
[radius-ep-n0-0]     2020/12/09 13:20:38.874 [TRACE] [infra.message_log.core] <<<<<<<< 
[radius-ep-n0-0]  
[radius-ep-n0-0] ***********************************************