Permalink Problem

My guess is that you already had a Category called anthidium, and you deleted it, then you re-created it. But WordPress storage this data in a “trash can” – so it could not create it using the same name.

Do a search in your database for this string :
‘/anthidium/’
using this plugin :
https://en-ca.ww.wp.xz.cn/plugins/better-search-replace/
Do a test run just to see if it exists.

If it does exist, I would then use this :
https://interconnectit.com/search-and-replace-for-wordpress-databases/
to replace the instances of anthidium-2.

Then re-save your permalinks :

Settings Permalinks Screen

Get a backup first!
https://en-ca.ww.wp.xz.cn/plugins/all-in-one-wp-migration/