Scan result is wrong

[drwpeng]

hi, comparison of sophos results and virustotal results:

docker run --rm -v /tmp/scanfile:/malware:ro malice/sophos:updated 012b1d09dd3c0a50e028c24c8daf908b5f69eceb 
{"sophos":{"infected":false**,"result":""**,"engine":"5.74.0","database":"5.77","updated":"20200831"}}

Below is the result of virustotal：
"Sophos": {
"category": "malicious",
"engine_name": "Sophos",
"engine_update": "20200505",
"engine_version": "4.98.0",
"method": "blacklist",
"result": "Mal/Generic-S"
},

After sophos is updated, the engine version is higher than that of vt. Why can't sophos find the virus?