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When I look at a milestone before it's reached "Paid" it displays the different dates that donations were made.
But then, when it's paid out, it shows only the date that all were paid out, next to each milestone as if that was the date of donation.
I'm guessing it's showing the date of the most recent status change on the donation. At least this is how it all appears to me.
But it would be way better to just keep the date of donation/delegation right there, it helps differentiate.