This is normal..
When you're growing up and establishing neuro circuits, it builds a fixed storage pattern.
Most people often store information patterned after "paths/places/locales" of repeated exposure.
Dreams take place along the walk to school or in school, or in a construct similar to your childhood home, apartment, etc.
It could also be a combination of the routes and places, so the dreamscape may resemble your house and school mashed together.
Then when new information is added later in life, it is tree-ed to similar memories / triggers along the old path.
It's a type of parity storage system, and the parity information is what's causing recollection / feeling of deja vu