"The Mandela effect is, depending on who you ask, either a weird phenomenon where large groups of people misremember the exact same given thing in the exact same way, or the pseudoscientific belief that some differences between one's memories and the real world are caused by changes to past events in the timeline."
https://rationalwiki.org/wiki/Mandela_effect
"The Mandela Effect refers to a situation in which a large mass of people believes that an event occurred when it did not. Looking at the origin of the Mandela effect, some famous examples, as well as some potential explanations for this strange confluence of perceptions can help to shed light on this unique phenomenon."
https://www.verywellmind.com/what-is-the-mandela-effect-4589394
"Blank Slate Technology is a form of time travel that enables the re-write of history at what are called intervention points."
"This is where it gets so complex because to interact with vertical time means you will alter the course of horizontal time."
"Isolating any of the elements contained within the Light-Encoded Reality Matrix, and changing it, it can change reality. And this is a fundamental construct of Blank Slate Technology."
"When events are altered or changed, they can have unintended and very unpredictable consequences."
https://glamour-and-discourse.blogspot.com/p/blank-slate-technology.html?m=1