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I managed to remove that gap removing some css like all the overriding display properties you have on those list items, but now I can’t reproduce it and I don’t know what I did before… no offense, your css is a mess :P
Try figuring out what exactly you want for the list items to do… float? inline-block? Inline-blocks tend to give problems when zooming because of the hacky way to remove the white-space gaps.