Why can Numista sometimes not sort coins by comments?

This isn't really a bug or big issue, just something i was wondering.
On some select pages Numista seems to not be able to sort coins of the same kind by it's comment
Example from:
N#107



(It's not the order i added them either, the second one with 2026 was just added today. So it's not that)

It seems to do pretty fine on most pages:
N#105



I know Numista has the “acquisition date” feature by now, which i will switch to at some point (Though doing that for 1300 coins will take me a while).
So this isn't really a bug report and just something i found curious and maybe it's an easy fix. Would be interesting to know why this happens.  

I am not 100% sure about this but I thought they just get listed in the order you've entered them in (or the last edit?).