When you upload photos to FotoJournal they’re resized into a number of different sizes. When you insert photos into your blog posts FotoJournal defaults to the 900 x 700 size where 900px is the longest side, regardless of orientation. For example a landscape photo will be 900px wide and a portrait one 900px high.
You can make portrait photos 900px wide by resizing them prior to uploading and ensuring that they are exactly 900px wide. Then, when inserting the photo make sure you select Original Size.