Does this make sense?
Lightroom is showing me the wrong image for a file. I just bought a Canon 5D Mark IV. I'm testing three or four shots, importing them into LightRoom, formatting the memory card and shooting 4 or more shots.
I shot three shots outside.
Imported them into Lightroom
Deleted 2 of the shots.
Shot 3 shots inside
And I see that 2 of the shots I just took inside show up as the images I took in the first pass from outside. As I import the files, which were inside shots, I see the old outside shots.
I noticed that the camera, a new Canon 5D Mark IV has it's File Numbering set to Auto Reset. So I think every time I format the card, it restarts the file numbers. When I import 2 files in the same day with the same file names into LightRoom, LightRoom gets confused.
Does that sound possible?
Did you also switch to the develop module with the shots that show wrong?
Just an idea ... It may be that the old preview is showing.
Which exact (numbers, not 'latest' or alike) version of LR are you using, on which OS?