403 Errors, Images not sizing correctly

I installed phastpress but I’m getting all kinds of issues with images loading (or not) loading.

On https://livingtowersflkeys.com/tower-garden-workshops/ the images flash up filling most of the page, before shrinking down to their size.

On https://livingtowersflkeys.com/tower-farm/ the second and third image are not loading at all.

Some developers have advised me I have lots of 403 errors due to Phastpress.

Can you help me fix this please?

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