Defender for endpoint incorrect malware reporting on security portal

We have few machines which had malware at the time of defender AV scan and the same was remediated by defender AV and an alert was generated on security portal. However it's been many days since malware was detected and remediated but the alert for this device still appears on security portal.

When checking the alert details it shows old alert only. 

Is this something related to incorrect defender for Endpoint reporting or do we need to check something else.