I was told by Splunk support that i was hitting SPL-160881 which was been partially resolved in 7.1.2 and later as well as ES 5.2.1 or later. However, we upgraded our setup to 7.1.6 and ES to 5.2.2 post which the duplicate occurrences have been very rare.
As you know the issue is only with the backend code of incident review dashboard which displays duplicate notables, although they do not actually exist. Splunk support had made it clear even before we upgraded setup to 7.1.6 and ES to 5.2.2, that the issue was not completely fixed yet and may recur rarely.
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