When the first photo of the gallery is a higher (portrait) photo then the rest, the thumbnail row at the the bottom doubles in height and the thumbnails are divided over 2 rows (always, independent of the amount of photos).
If the first photo is a normal landscape photo and a second of further on photo is portrait, this problem does not occur.
When the first photo of the gallery is a higher (portrait) photo then the rest, the thumbnail row at the the bottom doubles in height and the thumbnails are divided over 2 rows (always, independent of the amount of photos). If the first photo is a normal landscape photo and a second of further on photo is portrait, this problem does not occur.