incorrect Location data on pictures in Photos, how to fix?

Hi,

I have pictures taken in one particular spot (my apartment) going back several years.

I am trying to find a specific pic that I know was taken there, but is not showing up using other search methods. when searching by location I am presented with groups of photos that are scattered AROUND the apartment, up to 1/2 mile. How can I correct the data and show ALL photos taken over time in that single, exact location?

Thank you for your help.