You’re definitely not alone in asking about the accuracy of GlassWire. But we may have quite different positions on the importance of this issue.
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I don’t need a lot of significant digits.
I’m happy for network monitoring stats to be accurate within a tolerance of +/- 5%. They’re generally rounded anyway, e.g. if it is 986,458 bits then it is often rounded to 1.0 Mbit. There’s little value to me in the extra detail.
The only time I ever needed 100% accuracy is when comparing network monitors. The rest of the time it is not that important to me.
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I’m aware that if I want the stats it to be accurate then I should be measuring network traffic in the right place.
Application traffic is best measured on the local system.
Internet access is best measured at the Internet gateway/router.
So when we want to do both in the same place then we shouldn’t be surprised when compromises occur. The same applies to Windows built-in tools, NMap, WinPCap, Networx (old and new versions, with and without driver), PRTG, etc. I’ve never got them to agree completely and when they do agree they do not seem to agree all the time.