To reproduce: I want to add multiple items to a filter expression using the Is in list operator.  It seems it is space delimited. For example, I want to filter for 'In Progress' and 'Late'.  However, when I apply the filter it creates this 'In', 'Progress', and 'Late'. 

Workaround: Currently, the possible solution that I can suggest is to use underscores to separate the words , e.g. "In_Progress".