Board Thread:Ninjago Wiki News/@comment-35245651-20180704072956/@comment-30499831-20180831200321

Ninja72 wrote: Warptoad wrote: That's not a continuity error, it's just a picture. It's weird that it's from the intro, but it's not like we can't assume that they just happened to take a group picture that looks like that. I think he meant that since their new designs are because of time travel, there should not be a picture with their old designs. That was just a fourth wall joke.

https://twitter.com/TommyAndreasen/status/1017109278128328705

They look different for the same reason Garmadon looks different in Season 3 than the end of Season 2. He just does, don't worry about it

You can make up a reason yourself.