plugin says the files is smurshed - google says not?

I have a site that Google is reporting that several images require compressing.
Google pagespeed says:
Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 12.5KiB (26% reduction).
Losslessly compressing…loads/2013/06/RapidBi-Header-imagev7.png could save 6.5KiB (16% reduction).
Losslessly compressing…ntent/plugins/revslider/images/dummy.png could save 3.1KiB (96% reduction).
Losslessly compressing…ontent/themes/epik/images/search-mag.png could save 2.9KiB (88% reduction).
and yet smursh says they are compressed?

WordPress 4.5.1 running Epik theme
plugin version Version 2.2.2