Thanks Richard for explaining this. I have done a couple of tests some time ago 
(you can find these in this pastebin: https://8n1.org/20024/2eb4). Results from 
these tests were that even for vdevs that have newer data (and other data for 
that matter) than other vdevs, it does not guarantee that vdev will be picked 
as the source. And in a  2-way mirror there is only one vdev with the latest 
data / checksums. So, still not sure why this happens.
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