Could you please share the version of Lightroom that you are using?
Could you please share the Lightroom export settings with the help of a screenshot?
When you export any image, Lightroom shows the progress bar at the top left mentioning the count of images that are being exported.
Does that progress bar say exporting one photo at the time of export?
would suggest you to try to export in a new blank folder and then, check if it exports multiple versions.
The only way I can imagine that happening is if you are saving multiple copies. There is an export option that if there is a duplicate image name Lightroom will save with a new unique name, and that could be causing the problem. You might check your export options and change that option to overwrite without asking if it isn't already.
I don't ever save a "finished" version of an image even if I am satisfied. There isn't really a need for them, in my opinion. If I want to send an image to a lab to be printed, or to send one through e-mail, I will create a copy sized appropriately. Once the copy has been used is deleted from the system. Then, in the future, if I decide to make a change to that master image, I don't have to worry about creating another "finished" version. But, of course, everyone has a right to their own workflow.
Changing the destination folder seemed to do the trick!
I reread my original post and realized that I didn't explain as well as I could have. To answer your questions, I am using Lightroom 5.
By the way, I tried to apply the various other suggestions, but I could not find the appropriate export settings, meaning I could not find the options in the program. Perhaps this is due to conflicting versions.
In either case, a new destination folder has alleviated all my grief, so thanks a million!
I have the same issue. I'm using Lightroom 5.7.1. This happened to me a few times, but not it is happening more frequently. I tried exporting to a new folder. When I try to export one image it saves the image and it also saves a copy with the same file name but with a different number added to the end. When I open the files, there are one of each of the other photos in the catalog. See attached photo.
Yes, they are all different. All the photos in the folder. I only selected one but LR is acting like I selected them all. It seems the catalog was corrupt. I started a new one and it was fine. But, this is happening more and more while I'm editing photos. ;-(.
Just note that there are five shades of grey that can appear on the photo borders, so it is possible to not notice all the selected photos. The Brightest white and off white borders are all selected photos.
Pressing CTRL+D De-selects all photos then click on one photo to select it specifically, for the export.
Try that to see what exports.