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Dropdown filter not working

Hello everybody.

I’m looking for a solution to a dropdown filter problem I am having. Please note, I am a beginner and don’t know too much about web design as this is my first project learning from scratch. I was successful in creating a filter on my ‘All Cities’ page -

I tried to recreate this so I copied it over onto my ‘Job Board’ page and altered the CMS links. I’ve only changed the department filter, not the city filter yet. I published this site to test the feature but it does not work when I try to filter by department. -

Can anyone tell me what is missing or where I went wrong? Thanks for your help in advance.

Here is my public share link: LINK
(how to access public share link)