Error Unable to Load Visual: Join Paths are expected to Form a Tree. Two Join Paths To Table

Hi 

I am now getting the above error since updating PowerBI Desktop and it won't load a visual which seemed to work fine before. 

I have one active relationship joining the table and 2 inactive relationships joining elsewhere in the table so I can use Userrelationship to easier calculate using DAX. 

Context: I've joined a staff table joined to an operation table where it's possible the staff member will have one of a possible 3 roles within a row of data. i.e Staff 1, Staff 2, Staff 3. 

Any suggestions / ideas? 

Thanks