Ancestor has duplicate child in tree view
In the Tree view, my great-grandfather Thomas appears twice as a son of my great-great-grandmother Elizabeth.
The entries are identical - Thomas has the same portrait, the same wife and the same descendants down the line to me, and all with the same IDs in each set.
However, in my great-great-grandmother Elizabeth's Person page, he appears only once.
Should I fix the duplication (Is that possible and if so, how?), or should I just leave things alone in the hope that it will fix itself?
I closed and reopened Chrome, but that fixed nothing, so then I rebooted my laptop, in case there was a lingering glitch, but the problem is still there.
Thanks in advance for any advice