Inconsistent Thumbnail Size on Category Page

[tomharrison]

I've been customizing my site with CSS, but I think this question belongs in this forum because it seems like there might be a setting I'm missing.

On my "Category" page which shows all the galleries under a specific category, the size of the thumbnail images being display is inconsistent. On some category pages SmugMug shows large thumbnails, and on other category pages SmugMug shows small thumbnails.

Here is an example:

Small thumbnails: http://tomharrison.smugmug.com/Urban%20Life%20and%20Travel

Large thumbnails: http://tomharrison.smugmug.com/Music%20and%20Performing%20Arts

This makes this appear very inconsistent. I would like all category pages to use the same size for thumbnails. How can I change this?

[jfriend]

Five or less galleries shows large thumbs. More than five shows small thumbs. That's how Smugmug does it, no way to customize it.