This has happened a few times in a past, then went away in subsequent releases, now in last two Lightroom CC releases happened again.
Basically I am sorting out my photos by capture time (older to more recent) - that works fine by itself. I also do a lot of file selection and panoramic stitching in Lightroom directly, which ends up creating panoramic raw files alongside the raw files. The created panorama raw files take the capture time from the last photo used and, when added to Lightroom, used to go after the last photo used for panoramic stitching. Not anymore - since last two Lightroom CC updates they annoyingly get inserted before the last photo in panoramic sequence which is quite annoying really especially when you order file groups by panoramic sequences. This makes it quite difficult to deal when processing the shoots with quite a few panoramic sequences.
I am guessing it has something to do with secondary ordering when the timestamps of the capture are the same - that secondary ordering is not available to user and it seems that software keeps changing it. I'd appreciate it if that could be fixed (making secondary ordering configurable?). I am using Lightroom CC latest version on MacOS (latest version of OS).
Adobe released Lightroom 6.9/CC2015.9 today. This issue should be corrected in this release. Please give it a try and let us know if you see any further issues. Complete information about this update can be found at the Lightroom Journal: http://blogs.adobe.com/lightroomjournal/2017/03/lightroom-cc-2015-9-now-available.html If you don’t see the update in your Creative Cloud App, you can use the kbsc [Cmd/Ctrl]+[Opt/Alt]+[ R ] to refresh your app. If you are a perpetual license holder, you c...