I’ve updated our Known Issue article below to reflect that this is affecting the World Event Shop and some other offerings in the main Shop on the World Map as well such as the weekly event troop and spoils of war. It appears to be only North American players who are affected.
We have a dev working on all the shop issues at the moment.
https://gemsofwar.zendesk.com/hc/en-us/articles/5726818779535