Why are images in the second gallery a different size?

I've created a second gallery on the same page as the first (Yodelers Today). The original images for both galleries are all the same size. The thumbnail settings are the same for both galleries. Why are the images in the second gallery smaller? I can change the thumbnail settings for the second gallery to enlarge them but I'm wondering why they wouldn't automatically be the same?
You have access to the site if needed. Images attached.