Summary
The Novikov Self-consistency Principle states that one attempting to undo a cause of an effect will become the cause of the effect. For example, if a time traveller attempts to rewrite a war and prevent it from happening, they could end up kickstarting the war, raising suspicions that the enemy has been secretly developing time travel technology after accidentally revealing their means of arriving in the time of conflict. Because of this, it is impossible to do anything productive with membrane-hopping time travel to the past, except for making observations about events previously unknown or vaguely understood. Thankfully, this means going to the past can be done to research past events without the information brought back becoming redundant by the time history has changed.
Evidence
After the invention of the Continuum Beam, it was postulated that membranes could have space and time reversed, resulting in being able to navigate time easily. After being delayed for unknown reasons, the SSC-551 "Schwarzschild" made its first jump, and had ended up in a membrane following this spacetime structure. When the SSC-551 came back, it came back hours before its journey even started, leading to The Interdimensional Flight And Research Administration having to delay the flight on the grounds that their shipyards may have been hijacked. Of course, the flight went underway once things were resolved.