I remember experiencing similar issues with ggftw's wiki previously while working on one of the other wikis.
It /usually/ updates properly and will show for you after a while (at least a few days, I think?).
Just to clarify though, you want to change the image from the current one to the one with the ggftw border?
Aika (Feonir): Kukiko - 85 Saint | Enzeru - 59 Sentinel | Utae - 61 Pistoleer | Tsukebumi - 75 Saint
Proud member of the guild SkyLore.