Firefox linux (centos) responsive design image scaling

I have an arrow in circle. CSS:

img{
        float:left;
        width: 15%;
        max-width: 33px;
        height: auto;
    }

In windows xp (ie8,safari,opera,ff,chrome) I checked everything is ok. The image is getting bigger and smaller – no any lines. But in linux some lines appear from the right and at the bottom of the picture. I checked image several times – there are no any lines. How can it be fixed?

Linux:centos 6.4 64 FF:25,26

Answer

Maybe it will help you. I solved this problem by setting different name for all images. It seems that it helped. Anyway I opened a bug https://bugzilla.mozilla.org/show_bug.cgi?id=975358