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This one?
Your meme filenames ending in .jpg.png
These are really PNG files; the final suffix is the only one your file system reads. Renaming a PNG to JPG does not change the file format to JPG. If you are trying to save a file as JPG – as memefarmer recommends for compact filesize (I concur!) – you'll need to do something like Export As : JPEG in your graphics program; this will actually rewrite the image as a different file format and apply the correct filename extension.
Good to know. The .jpg.png suffix gives memefarmer a bit of trouble having to clean it up every time they encounter it.
<3