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Hints during cassandra version upgrade from 2.1.17 to 3.0.15

I was trying to upgrade 4 nodes in a Cluster. DC1 had nodes N1 and N2 DC2 had nodes N3 and N4

App server is connected to N1 and N2 nodes. RF = {DC1: 2, DC: 2} DC2 nodes where upgraded to 3.0.15 first. There were inconsistency in data in DC2 as was expected as data streaming (Hints) is not possible between different Cassandra versions. While upgrading N2 first in DC1, I noticed that the data was consistent among all nodes immediately while N1 still being older version. How is that possible

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