This is what I get when I click on Service Type dropdown menu.
You should clear cache, cookies etc and try again.
Or use a different browser.
Also make sure you are using https://www.fiverr.com and not a translated domain of Fiverr.
The error appears when you click on suggested category link and then click on dropdown menu of “Service Type” which appears above Gig Metadata. I’m not using any translation service. Its back-end coding error which Fiverr needs to rectify.