That graph is not saying that 67% of your people are homeless. That is a graph that represents the people who are angry in your colony, why they are angry. If you only had 3 angry people and 2 were homeless, it would say 67%.
Looks like unemployed newcomers stay homeless. When they get their first job, they find a houseplace for themselves. That is how you can get lots of homeless and lots of housing capacity in the same time.
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