ZimaBlade/Board TNAS Warning

Just got my ZimaBlade NAS kit today, and installed Truenas Scale. When I go to create the pool, it throws a warning that my 2 HDDs have non-unique serial numbers. Is it the same on the zimaboard when using the Zima Y Splitter? Is this because the 2 serial ports on the blade are not truly sata, but USB to SATA interfaces, or something to do with the Y splitter itself? I can still create the pool, but is a bit worrisome if a disk were to ever fail.