Hey Zaphi,
I’ve gone into the flexslider.css file and changed the:
“flexslider .slides img {width: 100%; display: block;}”
on line 26 and changed the 100% to 97.5% and I can no longer see the bleed through of the previous slide, Hope that helps you as a quick fix until someone with actual knowledge comes back to you.
I’ve got the same issue, my slider shows 20px of the previous slide (on the left) and misses 20px of the current slide (on the right) My images are 960x1440px.
Has anyone got a fix?