Bug in portfolio

Well that distance is extremly tight. the landscape mode comes with a width of 49.8% and the other modes with 24.9%
so for gap there are only 0.5% of width (on 1210px content width these are 6px
so on rounding errors there might be some inconsitences – if you like to have it a bit clearer (if there is a gap it is harder to see if +-1px is difference) try to set up:

.av-masonry-entry {
    width: 24.8%;
}

.av-masonry-entry.av-landscape-img {
    width: 49.7%;
}

by the way on my mac and firefox there is that little gap – but if you like it precise first try to get same dimensions vor images.
The Sundhedshus and Nyt Plejehjem ved Vejle there is a height difference of nearly 90px
Best would be to have landscape double width of normal and portrait images – portrait images the double height of normal and landscape images.