LR showing and sorting according to an incorrect read on capture date/time.

I don't import any videos to LrC but understand that the way capture date / time is encoded and interpreted can be less reliable and standardised, than it is with still photos.

If the imported video shows the correct info (for the original shooting of the video) in the file creation metadata, but something wrong shows as the Catalog's idea of when the capture was: you can Edit Capture Time and reset the Catalog to employ the file creation date instead. Doing this will not by itself move the file concerned, into any different folder. YOu would need to do that.

I had an issue some time ago with a tiimezone-shift causing a lot of photos from some travel to auto-file into inappropriately dated folders at import, and similarly this required both adjusting all their capture times and then moving a percentage of the photos into the adjacent "day" folders from within LrC. The fix was to adjust how I handled timezone settings in the camera going forward. 

So far as preventing this other issue from happening in the future, with videos, I haven't the experience to advise. But it's a similar case in that LrC provides no automatic way to move already-imported files into different folders after correcting their capture details.

MacOS shows the file creation date, not the capture date. That means that if you created a new copy, the file creation date will be the date you created that copy.