@MalseMarcel - different timeline

@MalseMarcel - same

@MalseMarcel - Saying Cap traveled back in time negates the rules of time travel set up for the MCU. Steve created an alternate timeline.

@Spock0Clock - I've seen the film four times now, and I think where the confusion comes (IMO) is the Ancient One/Hulk scene. In dialogue, Banner says something like "If we return the stones to their timeline," implying that a branch is still created but the stones are just in that branch now... but the VISUAL in the scene is the branch being destroyed and the original timeline remaining. And Hulk and Cap later say "Curb the branches."

These two rules are 100% clear:
1. You cannot change your own future. The future you come from IS the future.
2. If you do change the past, you are creating an alternate timeline.

Where the film is vague as [frick] is this: What happens if you don't change the past? If you revert it back to the original state, is there still a branch timeline, which is what Hulk's dialogue in the Ancient One scene implies, or has it been overwritten by the prime timeline, as the visual in the Ancient One scene implies? Are all branch realities bad or just the ones missing Infinity Stones?

Self-contained time loops would be possible in one of two scenarios and wouldn't in the other, so that's why the directors and writers are saying different stuff. They are very clear on the rules... up to a point. It is the returninf the stones, timeline restoration, curb the branches that the confusion lies.