One sata data port doesn't seem to work

I just received a zima blade nas kit. I used the included y cable to connect the 2 HDDs. On unraid, I only ever see one HDD. I took out the 2 data cables from the zima blade and switched them, and then the other disk shows up. Could I have a bad sata port on the computer itself?

I’m running into the same issue. My left port seems to be working but the right one doesn’t. This is even when using only one drive