The teen titian's meet their future self how it occurred was strange a portal opened and everything yet they saw older versions of themselves.

Robin meet Nightwing who was him in the future.

Starfire meet her future self and same for Beast Boy, Cyborg and Raven. The strange thing is that you were there they never meet you yet you came with the older version of themselves.

Robin said to Nightwing "Who's them?" Directly pointing at you.