Hi
It’s worth sticking your JPG file into an EXIF viewer to see what’s actually in there. Something like this one: http://exif-viewer.com/
Have a look at what it has for the GPSLongitude value: it’s expressed as three rationals (fractions): deg, min, sec. See if it’s negative (west) where it needs to be.
Related issue here Page not found - in that case the zero seconds value was stored as 0/0: a divide-by-zero error that some tools took as zero (so showed the photo in the right place), while others got very confused.