CATDOLL: In Fairy Tail, the color of Jubian's guild emblem changed. Was it a mistake made by the author?

Fairy Tail has entered a new chapter. Regardless of whether it is good or not, I feel that I can't understand it anyway. There is one thing that I am more concerned about; that is, the color of the guild emblem on Jubienne has changed. It was blue before, but now it has become white. This change should have occurred within a year after the end of the Hades Gate chapter and the disbandment of the guild. (ps: Since I didn't find a screenshot of the color comics in the Hades Gate chapter where I could see the emblem on Jubienne, I only found the previous front page and pictures in the TV animation)

413 Extra Chapter Front Page

Screenshots from TV anime

We can see that the emblems in previous works were all blue. We can look at the two pictures below, both of which are white emblems. So is this color change due to a mistake by the author Hiro Mashima or is there some other meaning?

Editor's friendly code + screenshots from comic 443

This is Hiro Mashima's latest graffiti work.

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