The files preceded with the period are files the mac operating system creates for files on non-natively formatted hard disks. They will contain a small preview for use in the finder and other stuff. They should normally not get created as Lightroom doesn't generate them but something on your operating system is doing this, probably to create the previews in finder. They are harmless nevertheless. You should normally not see them on your PC but you probably have set it up to not hide these invisible files. I don't understand why you are not seeing all your files though. That should not happen. How is your external formatted?
My external HD is FAT32. I notice when i plug in my HD to my PC there are alot of folders that are "greyed" or hidden with a ._. or ._ infront of the name that i cant access. I am assuming this is a MAC thing (like you stated above)
Checked my PC, the folder options didn't have a check next to the hide "hidden folders" box. That is now checked!
When I check the date created of those "hidden ._IMG" photos, it shows the exact time i exported them from lightroom. The jpg (viewable) copy of that photo, in the same folder , shows the date for the export as a previous date. I can also tell the changes that were made to the photo did not apply. I notice sometimes lightroom asked me to "overight" the file and sometimes it just exports it with no pop-up box, but i know there is a duplicate of that photo in that folder and it should have asked me. like I stated, some of my photos have the latest "export" time on them and some of them dont at all yet i just exported that file! Could it be that the original file and working folder are on my HD, and when i edit and work its runing off my HD vs my computers hardrive?
I am grasping at straws because this boggles my mind
FAT32 should work OK for this purpose. I was just curious if it was something different.
I think what is happening is that Lightroom is not correctly checking whether the image already exists in the folder. Do you delete the images from your PC or from your Mac after you transfer them? You might want to try only doing it from the Mac (which will delete the dot-files too). You might also want to reset the warnings dialogs in Lightroom, which is done from the preferences->general pane.