Thanks for your question and for posting the link to your site with the gallery example.
I spent some time investigating the example page you posted. The gallery display is heavily styled by your theme’s styles.css file, which has over 3,500 lines of style specifications. I was unable to find a specific reason why the individual gallery entries fail to align. I ran some experiments on my development system using the WordPress 2014 template but I could not reproduce the problem.
- Does this issue appear on all your galleries, or is it specific some of them?
- Have you tried a WordPress
[gallery]
shortcode to see if it also has this issue?
- When you change to the 2014 theme, do the gallery tags change to < figure >, < div > and < figcaption >?
- Is there any way you can post a link to the problem occurring with the 2014 theme?
- Have you tried adding
mla_style=none
to your shortcode? That would remove all MLA styling from the gallery.
- Have you tried an older theme such as WordPress Twenty Twelve?
I must admit that CSS is not one of my strengths. MLA produces the HTML tags and adds a few styles, but most of the styling is done by the theme. I haven’t found a specific MLA feature that could cause something like this. If you can give me more information I will keep trying to reproduce or investigate the cause. I regret the news is not more helpful.