Steps to Reproduce: In a ReplicationWiki test page
https://replication.uni-goettingen.de/replication/wiki/index.php/Special:BrowseData/Studies?Journal=%5B%5B%3ACategory%3AJAE%7CJAE%5D%5D&Article_year=2012&Article_year=2013&Article_year=2014 I cannot click to allow further values for properties for which one selection was already made.
Actual Results: When clicking as indicated for example by "Article year: (Click arrow to add another value)" the only values suggested are "none" or "other".
Expected Results: Further values should be shown to choose from. This worked when typing them manually into the URL as done in the example with 2012, 2013, and 2014 for article year.