New map of mtDNA haplogroup I

An I3a was found in Esperstedt, Germany in an early Bronze age burial - Unetice culture. ("Massive migration from the steppe is a source for Indo-European languages in Europe")
I3a mt-Hg was also found in Russia Yamnaya aDNA (3000 BC), It's also my Mt-Hg. I am rather interested in it's origins. It's pretty strange to have so many ancient DNA having this mt-Hg that is not so spread nowadays. Explanations?
To my understanding, Haplogroup I is a descendant of N1, haplogroup found in West Eurasia.

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