Sort order by date and time no longer works

Steps to reproduce

1. Open App
2. select arbitrary Golfer
3. select date time sort order, e.g. newest first

Expected behaviour

I‘d expect to see files in specified order with respect to file‘s modification time.

Actual behaviour

Sort order seems to be somewhat arbitrary, because there are files displayed newer even though I didn‘t modify any of these (can be seen by displaying details)

Screenshots

Here is a screenshot of a file, which is flaged as modified 17 minutes ago whereas details contain a modifcation date 13 days ago!

Logs

If applicable, you can post the iOS app or server logs (removing any sensitive information).

Reasoning or why should it be changed/implemented?

Environment data

iOS version: e.g. iOS 14.4.1

Nextcloud iOS app version: see More > Settings

Server operating system:

Web server: Apache, nginx

Database:

PHP version:

Nextcloud version: see Nextcloud admin page

Start by reproducing the issue in the iOS app: choose a golfer, sort by date and time, and compare the displayed order with each file's details. Investigate the sorting path using the reported mismatch between a file shown as modified 17 minutes ago and its 13-day modification date; done means files consistently follow the selected modification-time order.