Thumbnail gallery has gaps

I’m having that problem as well. Sometimes there are 2 landscapes next to eachother, sometimes followed by 1 portrait… But later there is only 1 landscape, completely at the right etc

Looks like a 4-year-old made the gallery ??

To fix white spaces in the thumbnail frames in nextgen gallerys where the thumbnails are 160px high replace with this in the gallery style nggallery.css if the thumbnails are smaller you can play with the height

.ngg-gallery-thumbnail {
float: left;
margin-right: 5px;
text-align: center;
height:180px;
}