ImageCache profile view not displaying propperly in Zen

Hello,

I am using a view with image fields that should be displayed using an ImageCache profile display and I've realized that they are displayed propperly when using Garland but not when using my custom Zen subtheme.

I'd like to make a user lists whith all the avatars with the same size (that's why I'm using ImageCache Profile) (see the attached view below). What should I change in order to display all user pictures at the same size?

Thanks