Nav bar and banner image change size on shop and cart pages

Hi, I am a total newbie-this is my first post, and I don’t know what I am doing with code other than just cutting and pasting so please bare with me ??
For some reason my nav bar/banner image changes size (gets bigger) on my shop and cart pages only. Is it possible for this not to happen? I use WooCommerce and the Stout theme. Thanks! Chip
I posted this over in the developer forum too. I’m not sure which one is best so sorry for the double post….

The page I need help with: [log in to see the link]