Possible reasons

• the CSS of your Joomla template might influence the image size. Most likely is a template which sets the height of an image to auto !important. This will never work. Just remove the !important. While this is sometimes hidden in the template’s CSS files, there is a chance that you can turn it off in your template’s options.

  Figure 9.2. Common CSS issue (screenshot)

  
  
  
• Your images are too small to fill the available width
• You uploaded your images using FTP? You used the Sync Database process? Make sure you pressed Start and not only Synchronize events only - the second phase, Synchronize Images, is the one which loads the image metadata into the database. It is important for Event Gallery to know the size of the images to render them correctly.
• image metadata is missing. Please run the "sync database"-process for event and images. This will write the necessary image dimensions to the database. Missing data can occur if you modify images using FTP or an issue during the upload in Event Gallery.