Not sure if this is a bug but there's an inconsistency between the block alignment/padding.
Screen Shot 2018-01-11 at 22.26.35.png
I've adjusted this for the next release. if you want to fix it now, you can place this into extra.less:

@media (max-width: @xf-responsiveMedium)
    .XenBase .xb-footer-block
        padding-right: 0;
        padding-left: 0;
            margin-left: 0;
            margin-right: 0;

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