Hi @Hayley Yates ,
welocme to the Atlassian community!
It seems that search on the backlog became case sensitive. That should the problem. You need to contact the Atlassian support. Take a look to the same issue here https://community.atlassian.com/t5/Jira-questions/Has-backlog-search-become-case-sensitive/qaq-p/2027480
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