Date sort order bug?

Hi all, long time no visit!

I'm now on a Kobo Auroa H2O.

Recently (for the last several months) sideloaded books have been appearing at the back of the recent pages rather than at page 1.

Any ideas? I have searched here but not seen anything? - if this is a known issue, please point me to it!


I only sideload through Calibre and have wifi off. Any other information that would be useful?