Steps to reproduce:

1 - Add the attached light module to your Magnolia instance.

2 - Request any image through the focalpoint with an url similar to this:
.imaging/focalpoint/400x239/dam/jcr:ab2c4750-f59a-4b45-87f3-ec27de99d1a5/kitchen.jpg
 
Even though the requested width is defined by the last variation on the configuration file, it returns the image with a 700 pixels width rather than 400.
This behaviour is altered if you play around moving the variations order, like defining the variation that allows 400px width on the first place rather than the last.