You have noticed that the date of malware(virus) definitions is outdated and does not change even though the LiveUpdate was successful and the Status > Hosts > "Software and Services" tab shows all the scanners with updated malware definitions.
Release : 10.7
This is likely due to database corruption that is causing the date to be incorrect.
Contact technical support for further assistance. You may also be able to resolve this issue by restoring a backup that is older than the date listed for the malware definitions.