Today I learned, images cache for a few hours on this wiki and nothing will force them to update faster. Just have faith after hitting Save Changes.
--Rihlsul (talk) 14:01, 31 May 2016 (UTC)
Per IndieWikis, this is due to this whole domain being handled through CloudFlare, and that defaults to a 4 hour cache. There is no method for clearing the cache without admin access to the CloudFlare account.
--Rihlsul (talk) 06:23, 1 June 2016 (UTC)