In 2014, the One Piece anime was in the G-8 filler arc after the Sky Island material, according to coverage that notes the series had caught up with the manga and needed extra story content that year.

What that means

  • Not a manga canon arc: G-8 is an anime-only filler arc.
  • Why it happened: The anime needed time while the manga stayed ahead.
  • Placement: It comes right after the crew’s sky adventure and before later story arcs resume.

Quick note

If you meant the manga in 2014, it was in a different place than the anime, since the anime and manga timelines do not always match exactly.

TL;DR: One Piece was on the G-8 filler arc in 2014.