I'm a bit confused by the listed results. For example one mask is listed a KN95 and has a fail although filtering is stated as 99.87%. Isn't a KN95 specifically rated to hold at least 95% of particles of a certain size? Anything above is irrelevant as it holds up to the minimum requirement? Or is it 99.87% of 95% which I would still consider within margins of manufacturing variations.

A KN95 that filtered only 75% is something I would be concerned of. Additionally the fit in someones face can turn a good N99 mask into a useless mask which is also an important factor.