They ask people on the street, with amazing results

Fox news covers the Mandela Effect. Dr. Gene A. Brewer, Associate Professor, ASU Department of Psychology, suggests because our brains all work the same way, when one has a false memory, other have it the same way too.

Dr. Brewer points to "recombination", which is the way the brain takes fragments of the past in order to create what it thinks is the actual memory, but has had to fill in some blanks from missing pieces.

He also controversially points the finger to the people experiencing the Mandela Effect in online groups themselves:

We communicate the false memories through the groups that we are associated to, and that leads to a cultural false memory where many people hold the same belief that things happened that didn't really happen.