I usually export my photos to jpgs into a subfolder under the original folder where the raws are.
To do this, I choose "Same folder as original photo", "Put in subfolder" and "Add to this catalog".
It always worked fine, but today I discovered that Lightroom is creating two copies of the jpg;
one inside the subfolder, as I want it, and one besides the raw file, in the original folder.
The funny thing is that when I go to see the original folder which contains the raw files from Windows,
the unwanted "copy" is not there. It's just in the catalog.
And, even worse, when I erase one of the two jpgs from Lightroom (no matter which one), the other one is erased too.
I'm using Lightroom 5.6 on Windows 8.1.
In the Library menu, do you have "show photos in subfolders" checked? If you do, then those JPEG images in the subfolder will display alongside the raw files.
That was it... thank you!