I am also experiencing this issue with a slightly larger sample size.
I have 10 librarians that share a house, all of which are employed by seven job sites (as seen below).
2019-05-19, 09:09:29 PM UTC
2019-05-19, 09:09:30 PM UTC
Jobsites.pngVillagers.png
Joshua SchoonmakerJoshua Schoonmaker
MC-150503
I am also experiencing this issue with a slightly larger sample size.
I have 10 librarians that share a house, all of which are employed by seven job sites (as seen below).