As eric mentioned, it is always good to post the questions in the appropriate space.
However, your hardware setup as you described, looks fine. And, since all disks are showing shelf ID 1, I suppose the system would be working fine without any issues. Then, there may be other reasons for the blinking display.
1. could be a hardware problem with the front panel display
2. the connecting circutry may have some issues
3. the ID selector switch has some issues
4. some other issue which I am not aware of .. 😞
Please go through the following KB articles, and if necessary, contact NetApp technical support and open a case.