Just like the paradox mentioned in the last episode of Fringe, maybe each time and space obtained some kind of "vaccine" at the same time as the invasion occurred, so that the time and space of the same time line can jump out of the time line and develop independently - the future determines the past, the past no longer affect the future.
"Invasion of the Past" reinvents its own future. Judging from the tree diagram, the "past" has become countless different "invaded past", and then grafted onto the branches of "the future extension" of "collide with the future", continuing its own story.
Suddenly remembered that Fringe also has JJ involved, no wonder the paradox routine is so familiar.
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