Hi, do you have more information about the context (do you use them in Substance Designer/Painter/Player, or in an integration, which OS) ?
I quickly tried using Substance Designer 6/ Painter 2 and Player 6 (Windows platform), it seems to be ok. We also ran a couple of tests before publishing them.
If you use them in an integration, it may be due to the fact this integration use an older version of Substance engine. Those materials use last engine features, the incompatibility may be due to this.
Let me know if you have more details, thanks.