Thumbnail navigation not displaying properly on Gallery Pages

Hi folks!

The height of the thumbnail navigation is inconsistent on my gallery pages. It's set for 75px but some are cut off, others are squished. See below.

It doesn't seem to have anything to do with the focal points of each image as many that are centered are cut off, if they're landscape or portrait, and the image sizes are relatively consistent throughout. I assumed that they would automatically be fit to the thumb container, but this doesn't seem to be the case.

Any help is greatly appreciated.

Allison

URL: larrysosnowphotography.com/subwayTemplate: Miller (Brine)