left alone files in c:\windows\temp\pdexxx.tmp location

We have configured central quarantine server for the clients to automatically submit Quarantined items to the CQS and we have about 30000 managed endpoints. lately we notice there are several pdexxx.tmp files showing as infected and the action taken as left alone. attached the screenshot from the risk log for reference. sequence is that the scheduled scan quarantines a file and then as per the risk log there shows a manual scan (actually nobody initiated the manual SEP scan) and shows several pdexxx.tmp files as infected and left alone but these files are actually not present on the endpoint. Please help us to fix this issue as this has become a major problem in the environment. Has anyone ever come across with such scenarios.