PictureFill issue – images created but doesn’t seem to work

Thanks a lot for the plugin.

I’m using PictureFill on our website (apptamin.com). You’ll see some icons on the homepage (app stores, video ads, etc.). I loaded a bigger image (512×560) for those icons so it could generate the images (which is the case when I check the “details” of an image”. I’m displaying them with a 128px width, however (retina display or not) it always loads the 512×560 image which makes me think that the plugin is not working correctly (that I’m not using it correctly I mean).

I also can’t figure out how to have the thumbnail from my Robo galleries display for retina screens (the ones on this page https://www.apptamin.com/app-videos/ look terrible on a phone for example). Even though I uploaded the full 1920×1080 screenshot through the retina plugin.

What am I doing wrong?