FRiC gave kudos to Marcos in Secure Browser Warning
It doesn't affect any functionality, it's just a minor bug in internal reporting. However, you can suppress the notification by disabling it in the application statuses setup:
The first check will suppress it on the client while the other (Send) will suppress it in the ESET PROTECT console.
FRiC gave kudos to MartinK in ESMC blocked by ESET Endpoint
I think this behavior has been already reported and probably fixed in the meantime. Maybe @Marcos will know more details of whether module responsible for scanning network has been updated in the meantime. It is also possible that update was canceled which might explain why only specific devices were affected.