BCH Share rejected: duplicate share

[seoseo29]

[2023-01-31 15:11:53.1691] [I] [bch] [0HMO3GG3818JP] Share rejected: duplicate share [Antminer BHB42XXX/Tue Mar 22 11:52:15 CST 2022]

config
"ports": {
"8888": {
"listenAddress": "0.0.0.0",
"difficulty": 30000.0,
"tls": false,
"tlsPfxFile": "/var/lib/certs/mycert.pfx",
"multiplyDifficulty": true,
"varDiff": {
"minDiff": 30000.0,
"maxDiff": 300000.0,
"targetTime": 15,
"retargetTime": 90,
"variancePercent": 30,
"maxDelta": 500
}

Hi! How to fix it?