suggests that Netguard may be out of date, or reporting a false positive, which is why I recommend the other scans as a cross check.
Antivirus ans security programs are only as good as the definition files they receive, and perhaps, if you turn it on their heuristic prediction technologies. They aren't infallable. Whilst you should normally only run one security program as two could cause conflicts, a different scanner can often confirm if odd behaviour of the PC is something to be concerned about.