Hi,
We have the same problem in our environment. Randomly the user domain information is wrong in the Asset summary page.
Example:
I show the Asset "PC1". This Windows computer is member of domain named "MYDOM". In the Summary, the "Last User" field show my: MYDOM\user55... But in fact, It don't exist any "user55" in my domain MYDOM !!!
The "user55" is a local user.
Then, LS should show me:
PC1\user55 or just user55. But certainly not MYDOM\user55 because it not exist ! In hope someone a DEV team will show this message and fix in next releases.