2. This is most likely caused by one of the photos in the gallery having too small dimensions. Please make sure you use photos in these galleries that are at least 524x524px. Thee bigger the better. But not to strain your hosting I would not recommend going over 3750x3750px. WordPress and the theme will automatically create scaled versions of the images for you from the big ones you provide.
1. These were actually designed for horizontal shots, and are cropped on purpose for consistency between posts. To bring that customization to life you’d need to put in a fair amount of custom coding.
This reply was modified 6 months, 2 weeks ago by Paul.