CMC does not show full height blade as "Extension of slot...", but as a repeat

I have an M1000e chassis with eight full height blades M915s.

Of the eight lower slots X, 6 appear correctly as Extension of X-8. The description is:

"This slot is an extension of the server in slot X-8"

However in two lower slots N, the slot information is repeated from slot N-8 and it is not treated as a slot extension.

Any reason for this weirdness?

I have observed this in two other M1000e, yet another M1000e is perfect in that all eight lower slots show as extensions.

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