Time is convoluted. This is through the use of advanced technology devices.
As soon as the machines were turned on a pathway was simultaneously opened for beings to connect with this plane from other times and parallel realities.
As well, there were beings that were created that would be able to gather information and perform tasks through transtemporal systems that humans could not yet operate through.
The result was something like activating the devices and opening the gateways only to instantly have a fleet of future military personnel and other worldly beings instantly attempting to make contact with our civilization.
The military personnel proclaimed that a kind of silent invasion had occurred through the use of the very technology that we were using to communicate with them. They said thousands of years had passed since they had first activated the devices and for us this was only a few moments if not instantaneously due to the way the gateways function.
The other worldly beings were either silently observant or they would set up these kinds of time barriers and holotropic illusions that would ultimately render a person consciously entrained to their frequencies and this was a form of hypnosis that was utilized to control the minds of humans.
It was concluded that the other worldly beings were on a mission to obtain human DNA for some kind of genetic experimentation or possibly a reconstruction of a species.
Whether the species that was being experimented on was the future human race or their own species from some other reality was not initially understood.
The important part to comprehend here is that the entirety of the multiple ages of influences and changes to multiple species took place in time but the effects were noticed immediately as soon as the technology to enable communication and travel was developed here in this Earth reality.
An entire storyline had developed, a galactic history and future of humanity.
This is one part of the convoluted aspect which is how as soon as these technologies were enabled, we opened our timeline up to influence from the far future to the far past and this was simply seen as the point at which we finally came to understand why there were so many mysteries and onotological unknowns about the human race.
This was, in part, because our far history was influenced by the occurrence of events in the far future due to the development of such temporally altering technology in this civilization. The events had always been here, we simply came to a viewpoint where we could perceive them directly at the development of this technology.