You are attempting to search for an item in the Advanced Threat Protection 3.0 Entity, Endpoint or other searches. When you type or paste in a value in uppercase where an AND or an OR is anywhere in the value, the search gets broken up into two queries or if you specified a specific field to search, that field and a query for the characters after the AND or OR.
 

This will be addressed in a future version of the SEDR Appliance software. Until then, the solution is to only search with lowercase terms, since Entity searches are not case sensitive.