Taxonomy term archive not showing thumbnails, help?

Hi all,

I have set up a taxonomy of ‘departments’ and assigned various ‘people’ CPT to a selection of terms for that taxonomy (e.g. customer service, sales etc.).

I am now in the process of creating a template for the taxonomy terms archives (e.g. URL/departments/sales/) named taxonomy-departments.php

Everything on this page seems to be working fine except that the thumbnails for the people aren’t displaying, however the default avatar is. Also I have a CSS3 pseudo selector removing the margin on every 3rd post – .staff-excerpt:nth-child(3n+3) – on all other pages this works fine, but on this page it is removing the margin on every 2nd post.

Can anyone please help with getting the thumbnails and pseudo selector to display/work?

Here is my loop and code for the posts:

[Code moderated as per the Forum Rules. Please use the pastebin]

Many thanks,

Adam.