Quote Originally Posted by KELPIE View Post
He can't just live through to where they are now. That's not how "time travel" works in these movies. Unfortunately it was a bit of a goof.

The Directors in an interview have said that Cap used the watch to travel back at some point later in life from his alternate timeline. This all conveniently happened off screen.
Saw another reply that he time travelled to this time to give the shield. Anything's possible.

Nope, still one Tesseract and Loki has it. The one that was returned was returned earlier on in that same timeline.
Ok. My mistake. I forgot about going back further since they lost it to Loki.