Missing Photos in Folder Sync that are not missing in Lightroom

[bestcee]

I'm not sure if this is a bug, or simply something I am doing incorrectly. 

Windows OS, Intel Processor, NVIDIA Graphics
Edition: Windows 10 Home

Lightroom Classic, V12.2.1

My process: I manually move photos from my camera card to my Windows folder that Lightroom. Once that is finished, I open Lightroom Classic, navigate to that folder in the Library View. I right click on the folder name and choose "Synchronize Folder". One of the options, Remove missing photos from catalog shows 570 missing photos. This number has consistenly grown over the last month. If I choose "Show Missing Photos" in this box, Lightroom shows me 570 photos and puts them in a temporary collection. There's no grey x in the corner on the photos. If I right click and choose "Show in Explorer" Lightroom opens to the folder and the photo is there. 

If I go to Library - Find All Missing Photos, Lightroom tells me I have no missing photos in the catalog. All photos in this catalog are available.

Is this a bug? I don't dare delete any of the photos, or choose Remove missing photos, because I don't want the photos gone. Am I missing something to fix this problem? 

Thank you for any help. 

[JohanElzenga]

This could be the capitalization error: https://www.lightroomqueen.com/capitalization-catalog-error/

Sometimes Lightroom shows a duplicate folder, but not always. In this case, Lightroom probably sees that second folder when it analyses the folder for synchronisation and so it thinks the photos are missing from it. The easiest solution is to ignore it as long as the final synchronisation does not cause any problems.

[bestcee]

Nope, it's not a capitalization error. Thanks for the idea.

What I've figured out is it's a DNG/Jpeg error. I don't know how to fix it. 

My Google Pixel takes photos in DNG and JPG. I let it because it's nice to have the Raw photos sometimes, and it's nice to be able to share or print a quick jpg. Somehow, when the photos come into Lightroom, the program sometimes sees them as one photo with 2 types, sometimes 2 photos, and sometimes the missing photo and photo. 

In my attached photo, the yellow flagged photos are the ones that Lightroom has flagged as missing. The first photo of the pizza and the last photo of the dog do not have the missing photo issue. 

I don't know if this has been addressed somewhere, but I'm off to look. Or, if you know how to fix this, please let me know. 

[bestcee]

While not a great solution, this was able to fix my issue. 

https://www.danhartfordphoto.com/blog/2018/7/lr010-lr-classic-how-to-remove-redundant-jpgs

I'll see if it continues going forward. It's odd, because it's not every photo, just about 1 in 10 or so.