Open https://wefwef.app, and inspect the network tab of inspector, I can see that there is a 400 status code response on trying to load https://lemmy.world/api/v3/post/list?limit=30&page=1&sort=Active&type_=All. In the body of the response I see the message Origin is not allowed to make this request.
I can get lemmy.ml to load, and it doesn't have this error.
Could this perhaps be related to lemmy.world not allowing requests from the wefwef.app host?
I'm saying that wefwef app is giving us an error message saying that that lemmy.world web server is rejecting traffic from wefwef, so that's why the posts are loading.